Accounting Policies [Abstract] Accounting Policies [Abstract] Accounts And Notes Receivable Net Note receivable secured by real estate Accounts Payable Current Accounts payable Accounts Receivable Net Current Accounts receivable, net of allowance for doubtful accounts of $9,465 and $8,657 at September 30, 2013 and December 31, 2012, respectively Accrual For Taxes Other Than Income Taxes Current Tax reserves, non-income tax related Accrued Income Taxes Current Income taxes payable Accrued Liabilities Current Accrued liabilities Accrued Liabilities [Member] Accrued Liabilities [Member] Accumulated Depreciation Depletion And Amortization Property Plant And Equipment Less accumulated depreciation and amortization Accumulated Other Comprehensive Income Loss Net Of Tax Accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income [Member] Accumulated Other Comprehensive Income (Loss) [Member] Additional amount authorized by board of directors. Additional Amount Authorized By Board Of Directors Additional amount authorized by Board of Directors Additional Paid In Capital Additional paid-in capital Additional Paid In Capital [Member] Additional Paid-in Capital [Member] Additional reserve recorded under review program matter. Additional Reserve Recorded Under Review Program Matter Additional reserve Adjustments Related To Tax Withholding For Share Based Compensation Common stock in lieu of taxes Adjustments To Additional Paid In Capital Tax Effect From Share Based Compensation Excess tax benefits Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Admission advisory and related expenses policy. Admission Advisory And Related Expenses Policy Policy [Text Block] Admissions Advisory and Related Admissions advisory and related expenses. Admissions Advisory And Related Expenses Admissions advisory and related, including $953 and $645 for the three months ended September 30, 2013 and 2012, respectively, and $2,574 and $1,666 for the nine months ended September 30, 2013 and 2012, respectively, to related parties Advertising Costs Policy [Text Block] Advertising Advertising Expense Advertising Advisory services. Advisory Services [Member] Admissions Advisory and Related Expenses [Member] Allocated Share Based Compensation Expense Share-based compensation expense Allowance For Credit Losses On Financing Receivables Table [Text Block] Summary of Allowance for Doubtful Accounts Allowance For Credit Losses [Text Block] Allowance for Doubtful Accounts Allowance For Doubtful Accounts [Member] Allowance for Doubtful Accounts [Member] Allowance For Doubtful Accounts Receivable Current Allowance for doubtful accounts Amendment Flag Amendment Flag Amortization Of Financing Costs Amortization of debt issuance costs Amount related to student assistance anticipated to be paid . Amount Related To Student Assistance Anticipated To Be Paid Accrued liabilities will be paid over the next six months Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount University's stock options outstanding were excluded from the calculation of diluted earnings Area of the company's campus. Area Of Companys Campus Area of the company's campus in Phoenix, Arizona Assets Total assets Assets [Abstract] ASSETS: Assets Current Total current assets Assets Current [Abstract] Current assets Assets Held Under Capital Leases [Member] Equipment under Capital Leases [Member] Available For Sale Securities Amount of investments, available for sale Estimated Fair Value Available For Sale Securities Amortized Cost Adjusted Cost Amount of accumulated pre-tax unrealized gain before deducting pre-tax unrealized losses on investments in available-for-sale securities impacting investments. Available For Sale Securities Gross Unrealized Gain Accumulated In Investments Gross Unrealized Gains Amount of accumulated pre-tax unrealized loss before deducting pre-tax unrealized gain on investments in available-for-sale securities impacting investments. Available For Sale Securities Gross Unrealized Loss Accumulated In Investments Gross Unrealized (Losses) Average days from the date of receipt in which funds remain as restricted cash and cash equivalents. Average Days From Date Of Receipt In Which Funds Remain As Restricted Cash And Cash Equivalents Average days from the date of receipt in which funds remain as restricted cash and cash equivalents Award Type [Axis] Award Type [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Building [Member] Buildings [Member] Capital Lease Obligations Current Current portion of capital lease obligations Capital Lease Obligations Noncurrent Capital lease obligations, less current portion Cash and cash equivalent maturity period. Cash And Cash Equivalent Maturity Period Number of days from the date of receipt in which funds remain as restricted cash and cash equivalents Cash And Cash Equivalents At Carrying Value Cash and cash equivalents, end of period Cash and cash equivalents, beginning of period Cash and cash equivalents Cash And Cash Equivalents Period Increase Decrease Net increase in cash and cash equivalents Cash And Cash Equivalents Restricted Cash And Cash Equivalents Policy Restricted Cash and Cash Equivalents Cash Flow Noncash Investing And Financing Activities Disclosure [Abstract] Supplemental disclosure of non-cash investing and financing activities Commitments And Contingencies Commitments and contingencies Commitments And Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Commitments And Contingencies Disclosure [Text Block] Commitments and Contingencies Commitments And Contingencies Policy [Text Block] Commitments and Contingencies Common stock acquired, shares. Common Stock Acquired Shares Common stock acquired, shares Common Stock [Member] Common Stock [Member] Common Stock Par Or Stated Value Per Share Common stock, par value Common Stock Shares Authorized Common stock, shares authorized Common Stock Shares Issued Common stock, shares issued Common Stock Shares Outstanding Common stock, shares outstanding Common Stock Value Common stock, $0.01 par value, 100,000 shares authorized; 48,792 and 47,136 shares issued and 45,982 and 44,716 shares outstanding at September 30, 2013 and December 31, 2012, respectively Comprehensive Income Net Of Tax Comprehensive income Comprehensive income Computer Equipment [Member] Computer Equipment [Member] Consolidation Policy [Text Block] Principles of Consolidation Construction In Progress [Member] Construction in Progress [Member] Cost And Equity Method Investments Disclosure [Text Block] Investments Cost Of Sales Policy [Text Block] Instructional Costs and Services Costs And Expenses Total costs and expenses Costs And Expenses [Abstract] Costs and expenses: Current Fiscal Year End Date Current Fiscal Year End Date Customer Deposits Current Student deposits Debt Default Longterm Debt Amount Default interest amount Debt Disclosure [Abstract] Debt Disclosure [Abstract] Default amount of late payment penalty under dispute. Default Amount Of Late Payment Penalty Under Dispute Late payment penalty amount Deferred Income Tax Expense Benefit Deferred income taxes Deferred Revenue Current Deferred revenue Deferred Tax Assets Net Current Deferred income taxes Deferred Tax Liabilities Noncurrent Deferred income taxes, noncurrent Denominator. Denominator [Abstract] Denominator: Depreciation And Amortization Depreciation and amortization Derivative By Nature [Axis] Derivative, by Nature [Axis] Derivative Fair Value Of Derivative Liability Fair value of interest rate swap liability Derivative Fair Value Of Derivative Net Fair value of interest rate corridor instruments Derivative Fixed Interest Rate Fixed interest rate payable on the amortizing notional amount Derivative Inception Dates Inception date of derivative agreements Derivative Maturity Dates Maturity date of derivative agreements Derivative Name [Domain] Derivative, Name [Domain] Derivative Notional Amount Notional amount of interest rate swap Derivatives Policy [Text Block] Derivatives and Hedging Derivative variable interest rates. Derivative Variable Interest Rates Interest rate receivable on interest rate swap amortizing notional amount Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Disclosure Of Compensation Related Costs Share Based Payments [Text Block] Share-Based Compensation Document And Entity Information [Abstract] Document And Entity Information [Abstract] Document And Entity Information [Abstract] Document Fiscal Period Focus Document Fiscal Period Focus Document Fiscal Year Focus Document Fiscal Year Focus Document Period End Date Document Period End Date Document Type Document Type Due To Related Parties Current Due to related parties Earnings Per Share [Abstract] Earnings per share: Earnings Per Share Basic Basic income per share Earnings Per Share Diluted Diluted income per share Earnings Per Share [Text Block] Net Income Per Common Share Employee Related Liabilities Current Accrued compensation and benefits Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] Employee Service Share Based Compensation Tax Benefit From Compensation Expense Tax effect of share-based compensation Employee Stock Option [Member] Employee Stock Option [Member] Entity Central Index Key Entity Central Index Key Entity Common Stock Shares Outstanding Entity Common Stock, Shares Outstanding Entity Filer Category Entity Filer Category Entity Registrant Name Entity Registrant Name Equity [Abstract] Equity [Abstract] Equity Component [Domain] Equity Component [Domain] Excess Tax Benefit From Share Based Compensation Financing Activities Excess tax benefits from share-based compensation Excess Tax Benefit From Share Based Compensation Operating Activities Excess tax benefits from share-based compensation Executive Officer [Member] Executive Officers [Member] Expiration date on repurchase authorizations. Expiration Date On Repurchase Authorizations Expiration date on repurchase authorizations Fair Value Of Financial Instruments Policy Fair Value of Financial Instruments Financial statement presentation policy. Financial Statement Presentation Policy [Text Block] Financial Statement Presentation Fixed rate of interest on loans. Fixed Rate Of Interest On Loans Interest rate on loan Furniture And Fixtures [Member] Furniture, Fixtures and Equipment [Member] Gain Loss On Disposition Of Assets Loss on asset disposal Gain Loss On Sale Of Notes Receivable Gain on proceeds received from note receivable General And Administrative Expense General and administrative General And Administrative Expense [Member] General and Administrative [Member] Goodwill Goodwill Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments Income before income taxes Income Statement [Abstract] Income Statement [Abstract] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Income Taxes Paid Cash paid for income taxes Income Taxes Receivable Income taxes receivable Income Tax Expense Benefit Income tax expense Increase Decrease In Accounts Payable Trade Accounts payable Increase Decrease In Accounts Receivable Accounts receivable Increase Decrease In Accrued Income Taxes Payable Income taxes receivable/payable Increase Decrease In Accrued Liabilities Accrued liabilities and employee related liabilities Increase Decrease In Customer Deposits Student deposits Increase decrease in deferred rent. Increase Decrease In Deferred Rent Deferred rent Increase Decrease In Deferred Revenue Deferred revenue Increase Decrease In Due To Related Parties Current Due to/from related parties Increase Decrease In Operating Capital [Abstract] Changes in assets and liabilities: Increase Decrease In Prepaid Deferred Expense And Other Assets Prepaid expenses and other Increase Decrease In Restricted Cash Restricted funds held for derivative collateral Increase Decrease In Restricted Cash For Operating Activities Restricted cash and cash equivalents Costs directly attributable to educational services, including salaries and benefits for full-time faculty, administrators and academic advisors, and costs associated with adjunct faculty. Also includes costs for educational supplies such as books, costs associated with academic records and graduation, costs associated with collections from our students such as bad debt expense, and other university services such as evaluating transcripts. Instructional Costs And Services Instructional costs and services Instructional costs and services. Instructional Costs And Services [Member] Instructional Costs and Services [Member] Interest Expense Interest expense Interest expense on derivatives related to credit risk. Interest Expense On Derivatives Related To Credit Risk Interest expense on derivatives related to credit risk Interest income and other gains. Interest Income And Other Gains Interest and other income Interest Income Other Interest income and other income on the loan Interest Paid Cash paid for interest Interest rate corridor. Interest Rate Corridor [Member] Interest Rate Corridor [Member] Interest Rate Swap [Member] Interest Rate Swap [Member] Investment [Line Items] Investment [Line Items] Investment maturity period. Investment Maturity Period Maturity period of investments Investment Policy [Text Block] Investments Investments Debt And Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Investment [Table] Investment [Table] Investment Table [Text Block] Summary of Amounts Included in Investments Investment Type [Axis] Investment Type [Axis] Investment Type Categorization [Member] Investments [Domain] Land Improvements [Member] Land Improvements [Member] Land [Member] Land [Member] Lease And Rental Expense Total rent expense and related taxes and operating expenses, under operating leases Leasehold Improvements [Member] Leasehold Improvements [Member] Liabilities Total liabilities Liabilities And Stockholders Equity Total liabilities and stockholders' equity Liabilities And Stockholders Equity [Abstract] LIABILITIES AND STOCKHOLDERS' EQUITY: Liabilities Current Total current liabilities Liabilities Current [Abstract] Current liabilities Long Term Notes Payable Notes payable, less current portion Marketing And Advertising Expense Marketing and promotional Marketing and promotional policy. Marketing And Promotional Policy Policy [Text Block] Marketing and Promotional Maximum [Member] Maximum [Member] Maximum variable interest rate on thirty day LIBOR. Maximum Variable Interest Rate Description Interest rate payable on interest rate corridor if 30 day LIBOR is less than 1.5% Maximum variable interest rate on thirty day LIBOR equal to four percentage through six percentage. Maximum Variable Interest Rate Percentage Interest rate payable on interest rate corridor 30 day LIBOR equal to 1.5% through 3% Minimum [Member] Minimum [Member] Municipal securities. Municipal Securities [Member] Municipal Securities [Member] Net Cash Provided By Used In Financing Activities [Abstract] Cash flows provided by (used in) financing activities: Net Cash Provided By Used In Financing Activities Continuing Operations Net cash provided by (used in) financing activities Net Cash Provided By Used In Investing Activities [Abstract] Cash flows used in investing activities: Net Cash Provided By Used In Investing Activities Continuing Operations Net cash used in investing activities Net Cash Provided By Used In Operating Activities [Abstract] Cash flows provided by operating activities: Net Cash Provided By Used In Operating Activities Continuing Operations Net cash provided by operating activities Net Income Loss Net income Net income New Accounting Pronouncements Policy Policy [Text Block] Recent Accounting Pronouncements Non employee director voting rights and vesting description. Non Employee Director Voting Rights And Vesting Description Non employee director voting rights and vesting description Non employee members of board of directors. Non Employee Members Of Board Of Directors [Member] Non-Employee Members of Board of Directors [Member] Note receivable interest rate. Note Receivable Interest Rate Default interest and statutory trustee's fee Notes Payable Current Current portion of notes payable Notes Receivable Fair Value Disclosure Note receivable from a financial institution at fair market value Notes receivable fixed interest rate. Notes Receivable Fixed Interest Rate Interest rate on notes Notes receivable interest rate. Notes Receivable Interest Rate Default rate Notes receivable policy. Notes Receivable Policy [Text Block] Note Receivable Number of anniversaries of grant date upon which restricted stock units vest. Number Of Anniversaries Of Grant Date Upon Which Restricted Stock Units Vest Number of anniversaries of the vesting date following the date of grant Operating Income Loss Operating income Operating Leases Future Minimum Payments Due Total minimum payments Operating Leases Future Minimum Payments Due In Four Years 2017 Operating Leases Future Minimum Payments Due In Three Years 2016 Operating Leases Future Minimum Payments Due In Two Years 2015 Operating Leases Future Minimum Payments Due Thereafter Thereafter Operating Leases Future Minimum Payments Next Rolling Twelve Months 2014 Operating Leases Future Minimum Payments Remainder Of Fiscal Year 2013 (remaining three months) Operating Leases Of Lessee Disclosure [Text Block] Future Minimum Lease Payments under Operating Leases Organization Consolidation And Presentation Of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization Consolidation And Presentation Of Financial Statements Disclosure [Text Block] Nature of Business Other Assets Current Other current assets Other Assets Noncurrent Other assets Other Capitalized Property Plant And Equipment [Member] Other [Member] Other Comprehensive Income Loss Net Of Tax Period Increase Decrease [Abstract] Other comprehensive income (loss), net of tax: Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax Unrealized (losses) gains on hedging derivatives, net of taxes Unrealized (losses) gains on hedging derivatives, net of taxes of $56 and $26 for the three months ended September 30, 2013 and 2012, respectively, and $310 and $72 for the nine months ended September 30, 2013 and 2012, respectively Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax Unrealized (losses) gains on hedging derivatives, tax Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax Unrealized net gains on available-for-sale securities Other Liabilities Noncurrent Other noncurrent liabilities Other Noncurrent Liabilities [Member] Other Noncurrent Liabilities [Member] Payments For Repurchase Of Common Stock Repurchase of common shares including shares withheld in lieu of income taxes Payments To Acquire Investments Purchases of investments Payments To Acquire Productive Assets Capital expenditures Percent of financial aid earn by student. Percent Of Financial Aid Earn By Student Percent of financial aid earn by student Period for write off inactive student accounts. Period For Write Off Inactive Student Accounts Period for write off of inactive student accounts Pledged collateral as noncurrent restricted cash. Pledged Collateral As Noncurrent Restricted Cash Pledged collateral as restricted cash Preferred Stock Par Or Stated Value Per Share Preferred stock, par value Preferred Stock Shares Authorized Preferred stock, shares authorized Preferred Stock Shares Issued Preferred stock, shares issued Preferred Stock Shares Outstanding Preferred stock, shares outstanding Preferred Stock Value Preferred stock, $0.01 par value, 10,000 shares authorized; 0 shares issued and outstanding at September 30, 2013 and December 31, 2012 Prepaid royalties noncurrent. Prepaid Royalties Noncurrent Prepaid royalties Proceeds From Income Tax Refunds Cash received for income tax refunds Proceeds From Sale And Maturity Of Available For Sale Securities Proceeds from sale or maturity of investments Proceeds From Sale Of Notes Receivable Proceeds received from note receivable Proceeds From Stock Options Exercised Net proceeds from exercise of stock options Property Plant And Equipment [Abstract] Property, Plant and Equipment [Abstract] Property Plant And Equipment By Type [Axis] Property, Plant and Equipment, Type [Axis] Property Plant And Equipment Disclosure [Text Block] Property and Equipment, Net Property Plant And Equipment Gross Property and equipment Property Plant And Equipment [Line Items] Property, Plant and Equipment [Line Items] Property Plant And Equipment Net Property and equipment, net Property and equipment, net Property Plant And Equipment [Text Block] Summary of Property and Equipment, Net Property Plant And Equipment Type [Domain] Property, Plant and Equipment, Type [Domain] Provision For Doubtful Accounts Provision for bad debts Purchase of land related to off site development. Purchase Of Land Related To Offsite Development Purchase of land and building related to offsite development Purchases of property and equipment included in accounts payable. Purchases Of Property And Equipment Included In Accounts Payable Purchases of property and equipment included in accounts payable Range [Axis] Range [Axis] Range [Member] Range [Domain] Receivables [Abstract] Receivables [Abstract] Reduction in revenue due to scholarships offered to students. Reduction In Revenue Due To Scholarships Offered To Students Reduction in revenue due to scholarships offered to students Regulatory. Regulatory [Text Block] Regulatory Related Party Transaction Expenses From Transactions With Related Party Admissions advisory and related expenses to related parties Repayments Of Debt And Capital Lease Obligations Principal payments on notes payable and capital lease obligations Restricted Cash And Cash Equivalents At Carrying Value Restricted cash and cash equivalents Restricted cash and cash equivalents current. Restricted Cash And Cash Equivalents Current Reduced pledge collateral Restricted Cash And Cash Equivalents Noncurrent Restricted cash Restricted Stock [Member] Restricted Stock Grants [Member] Retained Earnings Accumulated Deficit Accumulated earnings Retained Earnings [Member] Accumulated Earnings [Member] Revenue Recognition Policy [Text Block] Revenue Recognition Sales Revenue Net Net revenue Schedule Of Available For Sale Securities [Line Items] Schedule of Available-for-sale Securities [Line Items] Schedule Of Available For Sale Securities [Table] Schedule of Available-for-sale Securities [Table] Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Table] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table] Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Text Block] Share-Based Compensation Expense Schedule Of Property Plant And Equipment [Table] Property, Plant and Equipment [Table] Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule Of Sharebased Compensation Restricted Stock And Restricted Stock Units Activity Table [Text Block] Summary of Activity Related to Restricted Stock Granted under Incentive Plan Schedule Of Share Based Compensation Stock Options Activity Table [Text Block] Summary of Activity Related to Stock Options Granted under Company's Incentive Plan Schedule Of Weighted Average Number Of Shares Table [Text Block] Summary of Weighted Average Number of Common Shares Outstanding Segment Reporting Policy Policy [Text Block] Segment Information Selling And Marketing Expense [Member] Marketing and Promotional [Member] Selling General And Administrative Expenses Policy [Text Block] General and Administrative Share Based Compensation Share-based compensation Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period 1 Vesting period Sharebased Compensation Arrangement By Sharebased Payment Award Award Vesting Rights Percentage Percentage of shares to vest each year Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period Total Shares, Forfeited, canceled or expired Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Weighted Average Grant Date Fair Value Weighted Average Grant Date Fair Value, Forfeited, cancelled or expired Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Shares granted Total Shares, Granted Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value Weighted Average Grant Date Fair Value, Granted Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number Total Shares, Outstanding, Ending Balance Total Shares, Outstanding, Beginning Balance Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value Weighted Average Grant Date Fair Value, Ending Balance Weighted Average Grant Date Fair Value, Beginning Balance Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Shares, Vested Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value Weighted Average Grant Date Fair Value, Vested Sharebased Compensation Arrangement By Sharebased Payment Award Expiration Period Expiration period of options Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant Total Shares, Available for issuance Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value 1 Aggregate Intrinsic Value, Exercisable Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number Total Shares, Exercisable Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price Weighted Average Exercise Price per Share, Exercisable Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term 1 Weighted Average Remaining Contractual Term (Years), Exercisable Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Total Shares, Forfeited, canceled or expired Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price Weighted Average Exercise Price per Share, Forfeited, canceled or expired Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Options granted Total Shares, Granted Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value Aggregate Intrinsic Value, Outstanding Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number Total Shares outstanding, Ending balance Total Shares outstanding, Beginning balance Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price Weighted Average Exercise Price per Share Outstanding, Ending balance Weighted Average Exercise Price per Share Outstanding, Beginning balance Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term 2 Weighted Average Remaining Contractual Term (Years), Outstanding Share Based Compensation Arrangements By Share Based Payment Award Award Type And Plan Name [Domain] Equity Award [Domain] Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price Weighted Average Exercise Price per Share, Exercised Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price Weighted Average Exercise Price per Share, Granted Share-based compensation expense net of tax. Share Based Compensation Expense Net Of Tax Share-based compensation expense, net of tax Share Price Value of closing stock price Shares Issued Ending Balance, Shares Beginning Balance, Shares Shares Paid For Tax Withholding For Share Based Compensation Shares withheld for taxes Shortfall tax expense from share-based compensation. Shortfall Tax Expense From Share Based Compensation Shortfall tax expense from share-based compensation Short Term Investments Investments Significant Accounting Policies [Text Block] Summary of Significant Accounting Policies Since approval of share repurchase plan. Since Approval Of Share Repurchase Plan [Member] Since Approval of Share Repurchase Plan [Member] Software Development [Member] Internally Developed Software [Member] Statement Equity Components [Axis] Equity Components [Axis] Statement [Line Items] Statement [Line Items] Statement Of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Statement Of Financial Position [Abstract] Statement of Financial Position [Abstract] Statement Of Income And Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Statement Of Stockholders Equity [Abstract] Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Statutory trustee fee due amount under dispute. Statutory Trustee Fee Due Amount Under Dispute Statutory trustee's fee amount Stockholders Equity Ending Balance Beginning Balance Total stockholders' equity Stockholders Equity [Abstract] Stockholders' equity Stockholders Equity [Line Items] Stockholders Equity [Line Items] Stockholders Equity [Line Items] Stockholders Equity [Table] Stockholders Equity [Table] Stockholders Equity [Table] Stock Issued During Period Shares Restricted Stock Award Forfeited Restricted shares forfeited Stock Issued During Period Shares Share Based Compensation Share-based compensation, Shares Stock Issued During Period Shares Stock Options Exercised Exercise of stock options, Shares Total Shares, Exercised Stock Issued During Period Value Share Based Compensation Share-based compensation Stock Issued During Period Value Stock Options Exercised Exercise of stock options Stock Repurchased During Period Shares Common stock purchased for treasury, Shares Stock Repurchased During Period Value Common stock purchased for treasury Stock Repurchase Program Authorized Amount Authorization amount for repurchase of common stock Stock Repurchase Program Remaining Authorized Repurchase Amount Remaining authorized repurchase amount Summary Of Significant Accounting Policies [Line Items] Summary Of Significant Accounting Policies [Line Items] Summary Of Significant Accounting Policies [Line Items] Summary Of Significant Accounting Policies [Table] Summary Of Significant Accounting Policies [Table] Summary Of Significant Accounting Policies [Table] Supplemental Cash Flow Information [Abstract] Supplemental disclosure of cash flow information Tax benefit of spirit warrant intangible. Tax Benefit Of Spirit Warrant Intangible Tax benefit of Spirit warrant intangible Text Block [Abstract] Text Block [Abstract] Title Of Individual [Axis] Title of Individual [Axis] Title Of Individual With Relationship To Entity [Domain] Relationship to Entity [Domain] Trade And Other Accounts Receivable Policy Allowance for Doubtful Accounts Treasury Stock [Member] Treasury Stock [Member] Treasury Stock Shares Treasury stock, shares Treasury Stock [Text Block] Treasury Stock Treasury Stock Value Treasury stock, at cost, 2,810 and 2,420 shares of common stock at September 30, 2013 and December 31, 2012 Treasury Stock Value Acquired Cost Method Aggregate cost shares of common stock Unaudited interim financial information. Unaudited Interim Financial Information Policy [Text Block] Unaudited Interim Financial Information Use Of Estimates Use of Estimates Valuation Allowances And Reserves Balance Balance at End of Period Balance at Beginning of Period Valuation Allowances And Reserves Charged To Cost And Expense Charged to Expense Valuation Allowances And Reserves Deductions Deductions Valuation Allowances And Reserves [Domain] Valuation Allowances and Reserves [Domain] Valuation Allowances And Reserves Type [Axis] Valuation Allowances and Reserves Type [Axis] Valuation And Qualifying Accounts Disclosure [Line Items] Valuation and Qualifying Accounts Disclosure [Line Items] Valuation And Qualifying Accounts Disclosure [Table] Valuation and Qualifying Accounts Disclosure [Table] Maximum variable interest rate on thirty day LIBOR exceeds six percentage. Variable Interest Rate Payable On Interest Rate Corridor Description Interest rate payable on interest rate corridor 30 day LIBOR exceeds 3.0% Weighted Average Number Diluted Shares Outstanding Adjustment Effect of dilutive stock options and restricted stock Weighted Average Number Of Diluted Shares Outstanding Diluted weighted average shares outstanding Diluted weighted average shares outstanding Weighted Average Number Of Shares Outstanding Basic Basic weighted average shares outstanding