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Condensed Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Cash flows from operating activities:    
Net income $ 23,989 $ 35,791
Adjustments to reconcile net income to net cash provided by operating activities:    
Amortization of gain on sale of assets (70) (70)
Amortization of deferred rent 147 378
Gain on sale of marketable securities   (66)
Amortization of deferred financing costs 200 65
Depreciation and amortization 5,817 4,904
Deferred income taxes (317) 818
Stock-based compensation 2,390 2,892
Changes in assets and liabilities:    
Tuition receivable, net 1,686 (3,700)
Other current assets (957) (1,989)
Other assets (154) 17
Accounts payable and accrued expenses 2,369 (5,339)
Income taxes payable and income taxes receivable 15,443 21,467
Unearned tuition (14,061) 11,808
Other long-term liabilities   196
Net cash provided by operating activities 36,482 67,172
Cash flows from investing activities:    
Purchases of property and equipment (4,050) (11,384)
Purchases of marketable securities   (2)
Proceeds from the sale of marketable securities   12,388
Net cash provided by (used in) investing activities (4,050) 1,002
Cash flows from financing activities:    
Common dividends paid (11,865) (13,174)
Repurchase of common stock   (127,237)
Proceeds from revolving credit facility   80,000
Payments on revolving credit facility (20,000)  
Payments on term loan (5,000)  
Payment of deferred financing costs   (776)
Net cash used in financing activities (36,865) (61,187)
Net increase (decrease) in cash and cash equivalents (4,433) 6,987
Cash and cash equivalents - beginning of period 57,137 64,107
Cash and cash equivalents - end of period 52,704 71,094
Non-cash transactions:    
Purchases of property and equipment included in accounts payable $ 1,225 $ 1,894