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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities:    
Net income $ 14,655 $ 20,880
Adjustments to reconcile net income to net cash provided by operating activities:    
Amortization of gain on sale of assets   (133)
Amortization of deferred rent (909) (859)
Amortization of deferred financing costs 131 131
Depreciation and amortization 9,915 8,975
Deferred income taxes (1,581) (1,560)
Stock-based compensation 5,937 5,654
Fair value adjustments 6,185 (1,994)
Changes in assets and liabilities:    
Tuition receivable, net (2,916) (137)
Other current assets 96 411
Other assets (824) 829
Accounts payable and accrued expenses 1,363 559
Income taxes payable and income taxes receivable (3,447) (3,153)
Contract liabilities 2,768 4,356
Other long-term liabilities (1,347) (1,193)
Net cash provided by operating activities 30,026 32,766
Cash flows from investing activities:    
Purchases of property and equipment (8,596) (8,435)
Net cash used in investing activities (8,596) (8,435)
Cash flows from financing activities:    
Common dividends paid (5,778) (5,707)
Net cash used in financing activities (5,778) (5,707)
Net increase in cash, cash equivalents, and restricted cash 15,652 18,624
Cash, cash equivalents, and restricted cash - beginning of period 156,448 129,758
Cash, cash equivalents, and restricted cash - end of period 172,100 148,382
Noncash transactions:    
Purchases of property and equipment included in accounts payable $ 1,252 $ 469