Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities:
Net income	$ 27,107	$ 23,084
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of gain on sale of assets	(133)	(211)
Amortization of deferred rent	(1,351)	(919)
Amortization of deferred financing costs	197	197
Depreciation and amortization	13,718	13,276
Deferred income taxes	(3,728)	(5,543)
Stock-based compensation	8,569	7,330
Changes in assets and liabilities:
Tuition receivable, net	(454)	425
Other current assets	(2,151)	(3,895)
Other assets	1,200	(2,264)
Accounts payable and accrued expenses	9,711	2,825
Income taxes payable and income taxes receivable	(4,401)	(4,854)
Deferred revenue	5,386	5,940
Other long-term liabilities	(9,298)	(5,284)
Net cash provided by operating activities	44,372	30,107
Cash flows from investing activities:
Purchases of property and equipment	(14,573)	(7,501)
Cash used in acquisition, net of cash acquired		(7,635)
Net cash used in investing activities	(14,573)	(15,136)
Cash flows from financing activities:
Payments of contingent consideration		(1,358)
Common dividends paid	(8,561)
Net cash used in financing activities	(8,561)	(1,358)
Net increase in cash and cash equivalents	21,238	13,613
Cash and cash equivalents - beginning of year	129,245	106,889
Cash and cash equivalents - end of year	150,483	120,502
Noncash transactions:
Purchases of property and equipment included in accounts payable	$ 749	$ 112