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Unaudited Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Cash flows from operating activities:    
Net income $ 17,231 $ 23,989
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 27 147
Amortization of deferred financing costs 195 200
Depreciation and amortization 6,190 5,817
Deferred income taxes (661) (317)
Stock-based compensation 2,250 2,390
Changes in assets and liabilities:    
Tuition receivable, net 1,081 1,686
Other current assets 1,645 (957)
Other assets (4) (154)
Accounts payable and accrued expenses (8,220) 2,369
Income taxes payable and income taxes receivable 11,847 15,443
Unearned tuition (265) (14,061)
Other long-term liabilities 147   
Net cash provided by operating activities 31,393 36,482
Cash flows from investing activities:    
Purchases of property and equipment (2,368) (4,050)
Net cash used in investing activities (2,368) (4,050)
Cash flows from financing activities:    
Repurchase of common stock (24,999)   
Payments on term loan (781) (5,000)
Payments on revolving credit facility    (20,000)
Common dividends paid    (11,865)
Net cash used in financing activities (25,780) (36,865)
Net (decrease) increase in cash and cash equivalents 3,245 (4,433)
Cash and cash equivalents - beginning of year 47,517 57,137
Cash and cash equivalents - end of year 50,762 52,704
Non-cash transactions:    
Purchases of property and equipment included in accounts payable $ 706 $ 1,225