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Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Cash flows provided by operating activities:    
Net income $ 30,067 $ 22,354
Adjustments to reconcile net income to net cash provided by operating activities:    
Share-based compensation 3,716 3,130
Excess tax benefits from share-based compensation (121)  
Amortization of debt issuance costs 32 30
Provision for bad debts 7,871 18,277
Depreciation and amortization 10,164 7,826
Exit costs   (64)
Deferred income taxes (2,187) 1,392
Loss on asset disposal 182  
Changes in assets and liabilities:    
Restricted cash and cash equivalents 1,633 1,588
Accounts receivable (4,419) (13,372)
Prepaid expenses and other (1,846) (1,127)
Due to/from related parties 92 (8,773)
Accounts payable (1,627) 4,996
Accrued liabilities and employee related liabilities 9,286 (3,102)
Accrued litigation loss   (5,200)
Income taxes receivable/payable 19,021 2,295
Deferred rent 682 2,704
Deferred revenue 9,383 6,833
Student deposits (2,354) (2,173)
Net cash provided by operating activities 79,575 37,614
Cash flows used in investing activities:    
Capital expenditures (50,454) (38,276)
Restricted funds held for derivative collateral and legal matter 180 5,405
Net cash used in investing activities (50,274) (32,871)
Cash flows provided by (used in) financing activities:    
Principal payments on notes payable and capital lease obligations (1,299) (1,892)
Repurchase of common shares (1,978) (22,369)
Debt issuance costs   (70)
Excess tax benefits from share-based compensation 121  
Net proceeds from exercise of stock options 3,426 603
Net cash provided by (used in) financing activities 270 (23,728)
Net increase (decrease) in cash and cash equivalents 29,571 (18,985)
Cash and cash equivalents, beginning of period 21,189 33,637
Cash and cash equivalents, end of period 50,760 14,652
Supplemental disclosure of cash flow information    
Cash paid for interest 286 145
Cash paid for income taxes 10,385 11,793
Supplemental disclosure of non-cash investing and financing activities    
Purchases of property and equipment included in accounts payable 2,888 6,791
Tax benefit of Spirit warrant intangible 134 127
Shortfall tax expense from share-based compensation $ 125 $ 47