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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Cash flows from operating activities:    
Net income $ 23,259 $ 28,460
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 (424) (471)
Amortization of deferred financing costs 390 390
Depreciation and amortization 9,292 10,827
Deferred income taxes (1,621) (358)
Stock-based compensation 4,923 4,507
Changes in assets and liabilities:    
Tuition receivable, net 1,554 2,019
Other current assets 2,357 $ 1,042
Other assets 2  
Accounts payable and accrued expenses (2,808) $ (5,376)
Income taxes payable and income taxes receivable 3,387 6,331
Deferred revenue 5,544 5,922
Other long-term liabilities (2,259) (7,956)
Net cash provided by operating activities 43,456 45,197
Cash flows from investing activities:    
Purchases of property and equipment (7,057) (2,319)
Net cash used in investing activities (7,057) (2,319)
Cash flows from financing activities:    
Payments on term loan (3,125) (1,562)
Net cash used in financing activities (3,125) (1,562)
Net increase in cash and cash equivalents 33,274 41,316
Cash and cash equivalents - beginning of period 162,283 94,760
Cash and cash equivalents - end of period 195,557 136,076
Non-cash transactions:    
Purchases of property and equipment included in accounts payable $ 546 $ 209