Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net income	$ 10,578	$ 12,420
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	(477)	(52)
Amortization of deferred financing costs	66	66
Depreciation and amortization	4,370	4,425
Deferred income taxes	762	(633)
Stock-based compensation	2,427	2,891
Changes in assets and liabilities:
Tuition receivable, net	19	717
Other current assets	629	(1,440)
Other assets	397	(2,983)
Accounts payable and accrued expenses	(2,836)	(4,335)
Income taxes payable and income taxes receivable	7,089	4,620
Deferred revenue	2,441	1,435
Other long-term liabilities	(335)	(2,380)
Net cash provided by operating activities	25,059	14,680
Cash flows from investing activities:
Purchases of property and equipment	(3,841)	(2,031)
Cash used in acquisition, net of cash acquired		(1,635)
Net cash used in investing activities	(3,841)	(3,666)
Cash flows from financing activities:
Payments of contingent consideration	(511)	(405)
Common dividends paid	(2,853)
Net cash used in financing activities	(3,364)	(405)
Net increase in cash and cash equivalents	17,854	10,609
Cash and cash equivalents - beginning of year	129,245	106,889
Cash and cash equivalents - end of year	147,099	117,498
Noncash transactions:
Purchases of property and equipment included in accounts payable	$ 571	$ 91