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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Cash flows provided by operating activities:    
Net income $ 48,538 $ 35,222
Adjustments to reconcile net income to net cash provided by operating activities:    
Share-based compensation 5,748 4,797
Excess tax benefits from share-based compensation (336)  
Amortization of debt issuance costs 48 42
Provision for bad debts 13,492 27,903
Depreciation and amortization 15,784 12,054
Litigation settlement   (5,200)
Lease termination fee   922
Exit costs   (64)
Deferred income taxes (2,152) 10,185
Loss on asset disposal 202  
Changes in assets and liabilities:    
Restricted cash and cash equivalents (912) (199)
Accounts receivable (10,552) (26,253)
Prepaid expenses and other (2,671) (4,577)
Due to/from related parties 101 (9,882)
Accounts payable (962) 1,757
Accrued liabilities and employee related liabilities 9,046 (4,208)
Income taxes receivable/payable 22,464 348
Deferred rent 612 3,123
Deferred revenue 24,956 19,712
Student deposits 1,328 (390)
Net cash provided by operating activities 124,734 65,292
Cash flows used in investing activities:    
Capital expenditures (73,619) (61,515)
Purchase of land and building related to future development (818)  
Restricted funds held for derivative collateral and legal matter 180 5,405
Net cash used in investing activities (74,257) (56,110)
Cash flows used in financing activities:    
Principal payments on notes payable and capital lease obligations (1,772) (2,856)
Repurchase of common shares (4,925) (22,371)
Debt issuance costs   (70)
Excess tax benefits from share-based compensation 336  
Net proceeds from exercise of stock options 4,339 1,477
Net cash used in financing activities (2,022) (23,820)
Net increase (decrease) in cash and cash equivalents 48,455 (14,638)
Cash and cash equivalents, beginning of period 21,189 33,637
Cash and cash equivalents, end of period 69,644 18,999
Supplemental disclosure of cash flow information    
Cash paid for interest 446 315
Cash paid for income taxes 19,615 12,790
Supplemental disclosure of non-cash investing and financing activities    
Purchases of property and equipment included in accounts payable 7,636 4,827
Purchases of equipment through capital lease obligations   801
Tax benefit of Spirit warrant intangible 199 194
Shortfall tax expense from share-based compensation $ 200 $ 117