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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Cash flows provided by operating activities:    
Net income $ 40,009 $ 30,067
Adjustments to reconcile net income to net cash provided by operating activities:    
Share-based compensation 4,905 3,716
Excess tax benefits from share-based compensation (3,465) (121)
Amortization of debt issuance costs   32
Provision for bad debts 9,485 7,871
Depreciation and amortization 12,141 10,164
Loss on asset disposal   182
Gain on proceeds received from note receivable (2,187)  
Deferred income taxes 1,050 (2,187)
Changes in assets and liabilities:    
Restricted cash and cash equivalents 4,508 1,633
Accounts receivable (10,179) (4,419)
Prepaid expenses and other (4,123) (1,846)
Due to/from related parties (66) 92
Accounts payable 119 (1,627)
Accrued liabilities and employee related liabilities 2,180 9,286
Income taxes receivable/payable (7,842) 19,021
Deferred rent (446) 682
Deferred revenue 2,971 9,383
Student deposits (5,024) (2,354)
Net cash provided by operating activities 44,036 79,575
Cash flows used in investing activities:    
Capital expenditures (38,008) (50,454)
Purchase of land and building related to future development (6,936)  
Purchases of investments (55,219)  
Proceeds from sale or maturity of investments 6,780  
Restricted funds held for derivative collateral 140 180
Proceeds received from note receivable 29,187  
Net cash used in investing activities (64,056) (50,274)
Cash flows provided by financing activities:    
Principal payments on notes payable and capital lease obligations (3,336) (1,299)
Repurchase of common shares including shares withheld in lieu of income taxes (8,491) (1,978)
Excess tax benefits from share-based compensation 3,465 121
Net proceeds from exercise of stock options 14,072 3,426
Net cash provided by financing activities 5,710 270
Net (decrease) increase in cash and cash equivalents (14,310) 29,571
Cash and cash equivalents, beginning of period 105,111 21,189
Cash and cash equivalents, end of period 90,801 50,760
Supplemental disclosure of cash flow information    
Cash paid for interest 1,059 286
Cash paid for income taxes 33,096 10,385
Cash received for income tax refunds 4 7,625
Supplemental disclosure of non-cash investing and financing activities    
Purchases of property and equipment included in accounts payable 2,033 2,888
Tax benefit of Spirit warrant intangible 134 134
Shortfall tax expense from share-based compensation $ 205 $ 125