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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Cash flows provided by operating activities:    
Net income $ 20,945 $ 14,469
Adjustments to reconcile net income to net cash provided by operating activities:    
Share-based compensation 2,170 1,694
Excess tax benefits from share-based compensation (3,499) (65)
Amortization of debt issuance costs   15
Provision for bad debts 4,941 4,122
Depreciation and amortization 5,951 5,032
Loss on asset disposal   182
Gain on proceeds received from note receivable (2,187)  
Deferred income taxes 1,739 (247)
Changes in assets and liabilities:    
Restricted cash and cash equivalents 6,284 5,661
Accounts receivable (4,641) (150)
Prepaid expenses and other (2,069) (1,104)
Due to/from related parties (94) 52
Accounts payable 2,112 742
Accrued liabilities and employee related liabilities (5,531) (2,798)
Income taxes receivable/payable 1,904 16,556
Deferred rent (193) 622
Deferred revenue 10,349 11,756
Student deposits (6,468) (5,699)
Net cash provided by operating activities 31,713 50,840
Cash flows used in investing activities:    
Capital expenditures (14,704) (16,876)
Purchase of land and building related to future development (1,438)  
Purchases of investments (23,810)  
Proceeds received from note receivable 29,187  
Net cash used in investing activities (10,765) (16,876)
Cash flows provided by financing activities:    
Principal payments on notes payable and capital lease obligations (1,672) (829)
Repurchase of common shares including shares withheld in lieu of income taxes (6,006)  
Excess tax benefits from share-based compensation 3,499 65
Net proceeds from exercise of stock options 5,859 2,311
Net cash provided by financing activities 1,680 1,547
Net increase in cash and cash equivalents 22,628 35,511
Cash and cash equivalents, beginning of period 105,111 21,189
Cash and cash equivalents, end of period 127,739 56,700
Supplemental disclosure of cash flow information    
Cash paid for interest 573 253
Cash paid for income taxes 10,566 1,061
Cash received for income tax refunds 2 7,522
Supplemental disclosure of non-cash investing and financing activities    
Purchases of property and equipment included in accounts payable 4,067 5,395
Tax benefit of Spirit warrant intangible 67 59
Shortfall tax expense from share-based compensation $ 74 $ 17