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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash flows from operating activities:    
Net income $ 12,420 $ 11,385
Adjustments to reconcile net income to net cash provided by operating activities:    
Amortization of gain on sale of assets (71) (71)
Amortization of deferred rent (52) (279)
Amortization of deferred financing costs 66 195
Depreciation and amortization 4,425 4,713
Deferred income taxes (633) (426)
Stock-based compensation 2,891 2,451
Changes in assets and liabilities:    
Tuition receivable, net 717 1,914
Other current assets (1,440) $ 2,573
Other assets (2,983)
Accounts payable and accrued expenses (4,335) $ (983)
Income taxes payable and income taxes receivable 4,620 7,547
Deferred revenue 1,435 2,504
Other long-term liabilities (2,380) (831)
Net cash provided by operating activities 14,680 30,692
Cash flows from investing activities:    
Purchases of property and equipment (2,031) $ (2,834)
Cash used in acquisition, net of cash acquired (1,635)
Net cash used in investing activities $ (3,666) $ (2,834)
Cash flows from financing activities:    
Payments on term loan (1,562)
Payment of contingent consideration $ (405) (300)
Net cash used in financing activities (405) (1,862)
Net increase in cash and cash equivalents 10,609 25,996
Cash and cash equivalents - beginning of period 106,889 162,283
Cash and cash equivalents - end of period 117,498 188,279
Non-cash transactions:    
Purchases of property and equipment included in accounts payable 91 $ 724
Changes in contingent consideration related to acquisitions $ 14,625