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Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Cash flows provided by operating activities:    
Net income $ 14,469 $ 9,481
Adjustments to reconcile net income to net cash provided by operating activities:    
Share-based compensation 1,694 1,430
Excess tax benefits from share-based compensation (65)  
Amortization of debt issuance costs 15 15
Provision for bad debts 4,122 10,034
Depreciation and amortization 5,032 3,826
Loss on asset disposal 182  
Exit costs   (24)
Deferred income taxes (247) (224)
Changes in assets and liabilities:    
Accounts receivable (150) (6,023)
Prepaid expenses and other (1,104) (119)
Due to/from related parties 52 (8,388)
Accounts payable 742 5,748
Accrued liabilities and employee related liabilities (2,798) (513)
Income taxes receivable/payable 16,556 6,665
Deferred rent 622 67
Deferred revenue 11,756 4,184
Student deposits (5,699) (2,746)
Net cash provided by operating activities 45,179 23,413
Cash flows used in investing activities:    
Capital expenditures (16,876) (14,668)
Change in restricted cash and cash equivalents 5,661 2,753
Net cash used in investing activities (11,215) (11,915)
Cash flows provided by (used in) financing activities:    
Principal payments on notes payable and capital lease obligations (829) (694)
Repurchase of common shares   (14,211)
Excess tax benefits from share-based compensation 65  
Net proceeds from exercise of stock options 2,311 13
Net cash provided by (used in) financing activities 1,547 (14,892)
Net increase (decrease) in cash and cash equivalents 35,511 (3,394)
Cash and cash equivalents, beginning of period 21,189 33,637
Cash and cash equivalents, end of period 56,700 30,243
Supplemental disclosure of cash flow information    
Cash paid for interest 253 107
Cash paid for income taxes 1,061 219
Supplemental disclosure of non-cash investing and financing activities    
Purchases of property and equipment included in accounts payable 5,395 5,631
Tax benefit of Spirit warrant intangible 59 70
Shortfall tax expense from share-based compensation $ 17