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Condensed Consolidated Statements Of Cash Flows (USD $)
In Thousands
 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Cash flows from operating activities:    
Net income $ 65,438 $ 72,036
Adjustments to reconcile net income to net cash provided by operating activities:    
Gain on sale of marketable securities (66)  
Amortization of gain on sale of assets (140) (141)
Amortization of deferred rent 599 (97)
Depreciation and amortization 10,165 8,502
Amortization of deferred financing costs 264  
Deferred income taxes (256) (2,340)
Stock-based compensation 6,328 6,097
Changes in assets and liabilities:    
Tuition receivable, net (338) (1,285)
Other current assets (874) (1,618)
Other assets 36 87
Accounts payable 3,944 4,797
Accrued expenses (6,880) 2,042
Income taxes payable 4,433 (643)
Excess tax benefits from stock-based payment arrangements   (1,676)
Unearned tuition 4,503 1,431
Deferred lease incentives 277 662
Net cash provided by operating activities 87,433 87,854
Cash flows from investing activities:    
Purchases of property and equipment (18,062) (22,647)
Purchases of marketable securities (2) (383)
Proceeds from the sale of marketable securities 12,388  
Net cash used in investing activities (5,676) (23,030)
Cash flows from financing activities:    
Common dividends paid (25,183) (20,897)
Proceeds from exercise of stock options   452
Excess tax benefits from stock-based payment arrangements (872) 1,676
Repurchase of common stock (182,664) (22,003)
Proceeds from revolving credit facility 95,000  
Payments on revolving credit facility (80,000)  
Proceeds from term loan 100,000  
Payment of deferred financing costs (2,459)  
Net cash used in financing activities (95,306) (40,772)
Net increase (decrease) in cash and cash equivalents (13,549) 24,052
Cash and cash equivalents - beginning of period 64,107 63,958
Cash and cash equivalents - end of period 50,558 88,010
Non-cash transactions:    
Purchases of property and equipment included in accounts payable $ 2,267 $ 1,793