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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash flows from operating activities:      
Net income $ 40,023 $ 46,356 $ 16,425
Adjustments to reconcile net income to net cash provided by operating activities:      
Amortization of gain on sale of assets (280) (280) (281)
Amortization of deferred rent (345) (1,092) (462)
Amortization of deferred financing costs 1,229 780 780
Depreciation and amortization 18,104 20,630 35,563
Deferred income taxes (4,006) (1,036) (23,435)
Stock-based compensation 10,213 9,453 9,291
Changes in assets and liabilities:      
Tuition receivable, net (1,991) 685 4,024
Other current assets 4,005 (2,862) 2,434
Other assets 22 219 494
Accounts payable and accrued expenses (752) 6,550 (116)
Income taxes payable and income taxes receivable 1,835 737 7,799
Deferred revenue 12,465 11,783 2,059
Other long-term liabilities (3,624) (14,373) 29,518
Net cash provided by operating activities 76,898 77,550 84,093
Cash flows from investing activities:      
Purchases of property and equipment (12,692) (6,902) (8,726)
Net cash used in investing activities (12,692) (6,902) (8,726)
Cash flows from financing activities:      
Payments on term loan (118,750) $ (3,125) $ (3,125)
Payment of deferred financing costs $ (850)
Repurchase of common stock $ (24,999)
Net cash used in financing activities $ (119,600) $ (3,125) (28,124)
Net increase (decrease) in cash and cash equivalents (55,394) 67,523 47,243
Cash and cash equivalents - beginning of year 162,283 94,760 47,517
Cash and cash equivalents - end of year 106,889 162,283 94,760
Non-cash transactions:      
Purchases of property and equipment included in accounts payable $ 365 $ 412 $ 47