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Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current assets
Cash and cash equivalents	$ 86,156us-gaap_CashAndCashEquivalentsAtCarryingValue	$ 65,238us-gaap_CashAndCashEquivalentsAtCarryingValue
Restricted cash, cash equivalents and investments	57,875us-gaap_RestrictedCashAndInvestmentsCurrent	67,840us-gaap_RestrictedCashAndInvestmentsCurrent
Investments	101,015us-gaap_AvailableForSaleSecuritiesCurrent	100,784us-gaap_AvailableForSaleSecuritiesCurrent
Accounts receivable, net	6,689us-gaap_AccountsReceivableNetCurrent	7,605us-gaap_AccountsReceivableNetCurrent
Deferred income taxes	6,106us-gaap_DeferredTaxAssetsNetCurrent	6,149us-gaap_DeferredTaxAssetsNetCurrent
Other current assets	20,240us-gaap_OtherAssetsCurrent	19,429us-gaap_OtherAssetsCurrent
Total current assets	278,081us-gaap_AssetsCurrent	267,045us-gaap_AssetsCurrent
Property and equipment, net	527,729us-gaap_PropertyPlantAndEquipmentNet	478,170us-gaap_PropertyPlantAndEquipmentNet
Prepaid royalties	3,577lope_PrepaidRoyaltiesNoncurrent	3,650lope_PrepaidRoyaltiesNoncurrent
Goodwill	2,941us-gaap_Goodwill	2,941us-gaap_Goodwill
Other assets	3,242us-gaap_OtherAssetsNoncurrent	3,907us-gaap_OtherAssetsNoncurrent
Total assets	815,570us-gaap_Assets	755,713us-gaap_Assets
Current liabilities
Accounts payable	34,316us-gaap_AccountsPayableCurrent	22,715us-gaap_AccountsPayableCurrent
Accrued compensation and benefits	18,216us-gaap_EmployeeRelatedLiabilitiesCurrent	23,995us-gaap_EmployeeRelatedLiabilitiesCurrent
Accrued liabilities	14,804us-gaap_AccruedLiabilitiesCurrent	13,533us-gaap_AccruedLiabilitiesCurrent
Income taxes payable	15,544us-gaap_AccruedIncomeTaxesCurrent	4,906us-gaap_AccruedIncomeTaxesCurrent
Student deposits	58,949us-gaap_CustomerDepositsCurrent	69,584us-gaap_CustomerDepositsCurrent
Deferred revenue	53,407us-gaap_DeferredRevenueCurrent	36,868us-gaap_DeferredRevenueCurrent
Due to related parties	420us-gaap_DueToRelatedPartiesCurrent	403us-gaap_DueToRelatedPartiesCurrent
Current portion of capital lease obligations	92us-gaap_CapitalLeaseObligationsCurrent	91us-gaap_CapitalLeaseObligationsCurrent
Current portion of notes payable	6,618us-gaap_NotesPayableCurrent	6,616us-gaap_NotesPayableCurrent
Total current liabilities	202,366us-gaap_LiabilitiesCurrent	178,711us-gaap_LiabilitiesCurrent
Capital lease obligations, less current portion	383us-gaap_CapitalLeaseObligationsNoncurrent	406us-gaap_CapitalLeaseObligationsNoncurrent
Other noncurrent liabilities	4,245us-gaap_OtherLiabilitiesNoncurrent	4,513us-gaap_OtherLiabilitiesNoncurrent
Deferred income taxes, noncurrent	17,166us-gaap_DeferredTaxLiabilitiesNoncurrent	15,974us-gaap_DeferredTaxLiabilitiesNoncurrent
Notes payable, less current portion	78,221us-gaap_LongTermNotesPayable	79,877us-gaap_LongTermNotesPayable
Total liabilities	302,381us-gaap_Liabilities	279,481us-gaap_Liabilities
Commitments and contingencies
Stockholders' equity
Preferred stock, $0.01 par value, 10,000 shares authorized; 0 shares issued and outstanding at March 31, 2015 and December 31, 2014
Common stock, $0.01 par value, 100,000 shares authorized; 50,164 and 49,746 shares issued and 47,068 and 46,744 shares outstanding at March 31, 2015 and December 31, 2014, respectively	502us-gaap_CommonStockValue	497us-gaap_CommonStockValue
Treasury stock, at cost, 3,096 and 3,002 shares of common stock at March 31, 2015 and December 31, 2014, respectively	(57,948)us-gaap_TreasuryStockValue	(53,770)us-gaap_TreasuryStockValue
Additional paid-in capital	165,734us-gaap_AdditionalPaidInCapital	158,549us-gaap_AdditionalPaidInCapital
Accumulated other comprehensive loss	(269)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax	(35)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Retained earnings	405,170us-gaap_RetainedEarningsAccumulatedDeficit	370,991us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders' equity	513,189us-gaap_StockholdersEquity	476,232us-gaap_StockholdersEquity
Total liabilities and stockholders' equity	$ 815,570us-gaap_LiabilitiesAndStockholdersEquity	$ 755,713us-gaap_LiabilitiesAndStockholdersEquity

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