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Unaudited Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Cash flows from operating activities:    
Net income $ 32,233 $ 45,201
Adjustments to reconcile net income to net cash provided by operating activities:    
Amortization of gain on sale of assets (140) (140)
Amortization of deferred rent (114) 148
Amortization of deferred financing costs 390 399
Depreciation and amortization 12,434 11,749
Deferred income taxes (1,447) (1,531)
Stock-based compensation 5,232 5,830
Changes in assets and liabilities:    
Tuition receivable, net (74) 788
Other current assets 2,496 357
Other assets (3) (133)
Accounts payable and accrued expenses (7,536) (7,752)
Income taxes payable and income taxes receivable 8,209 (136)
Unearned tuition (267) (12,203)
Other long-term liabilities 165 84
Net cash provided by operating activities 51,578 42,661
Cash flows from investing activities:    
Purchases of property and equipment (4,994) (9,871)
Net cash used in investing activities (4,994) (9,871)
Cash flows from financing activities:    
Repurchase of common stock (24,999)   
Payments on term loan (1,562) (12,500)
Payments on revolving credit facility    (33,000)
Proceeds from revolving credit facility    28,000
Common dividends paid    (23,737)
Net cash used in financing activities (26,561) (41,237)
Net (decrease) increase in cash and cash equivalents 20,023 (8,447)
Cash and cash equivalents - beginning of period 47,517 57,137
Cash and cash equivalents - end of period 67,540 48,690
Non-cash transactions:    
Purchases of property and equipment included in accounts payable $ 557 $ 585