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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash flows from operating activities:      
Net income $ 34,802 $ 40,023 $ 46,356
Adjustments to reconcile net income to net cash provided by operating activities:      
Amortization of gain on sale of assets (281) (280) (280)
Amortization of deferred rent (1,441) (345) (1,092)
Amortization of deferred financing costs 262 1,229 780
Depreciation and amortization 17,817 18,104 20,630
Deferred income taxes (8,697) (4,006) (1,036)
Stock-based compensation 10,767 10,213 9,453
Changes in assets and liabilities:      
Tuition receivable, net (1,453) (1,991) 685
Other current assets (3,949) 4,005 (2,862)
Other assets (1,865) 22 219
Accounts payable and accrued expenses (262) (752) 6,550
Income taxes payable and income taxes receivable (408) 1,835 737
Deferred revenue 7,018 12,465 11,783
Other long-term liabilities (7,800) (2,974) (13,946)
Net cash provided by operating activities 44,510 77,548 77,977
Cash flows from investing activities:      
Purchases of property and equipment (13,161) (12,692) (6,902)
Cash used in acquisition, net of cash acquired (7,635)    
Net cash used in investing activities (20,796) (12,692) (6,902)
Cash flows from financing activities:      
Payments on term loan   (118,750) (3,125)
Payments of contingent consideration (1,358) (650) (427)
Payment of deferred financing costs   (850)  
Net cash used in financing activities (1,358) (120,250) (3,552)
Net increase in cash and cash equivalents 22,356 (55,394) 67,523
Cash and cash equivalents - beginning of year 106,889 162,283 94,760
Cash and cash equivalents - end of year 129,245 106,889 162,283
Noncash transactions:      
Purchases of property and equipment included in accounts payable $ 349 $ 365 $ 412