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Unaudited Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Cash flows from operating activities:    
Net income $ 28,460 $ 32,233
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 (471) (114)
Amortization of deferred financing costs 390 390
Depreciation and amortization 10,827 12,434
Deferred income taxes (358) (1,447)
Stock-based compensation 4,507 5,232
Changes in assets and liabilities:    
Tuition receivable, net 2,019 (74)
Other current assets 1,042 2,496
Other assets    (3)
Accounts payable and accrued expenses (5,376) (7,536)
Income taxes payable and income taxes receivable 6,331 8,209
Deferred revenue 5,922 (267)
Other long-term liabilities (7,956) 165
Net cash provided by operating activities 45,197 51,578
Cash flows from investing activities:    
Purchases of property and equipment (2,319) (4,994)
Net cash used in investing activities (2,319) (4,994)
Cash flows from financing activities:    
Payments on term loan (1,562) (1,562)
Repurchase of common stock    (24,999)
Net cash used in financing activities (1,562) (26,561)
Net increase in cash and cash equivalents 41,316 20,023
Cash and cash equivalents - beginning of period 94,760 47,517
Cash and cash equivalents - end of period 136,076 67,540
Non-cash transactions:    
Purchases of property and equipment included in accounts payable $ 209 $ 557