Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net income	$ 20,880	$ 20,206
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of gain on sale of assets	(133)	(140)
Amortization of deferred rent	(859)	(446)
Amortization of deferred financing costs	131	131
Depreciation and amortization	8,975	8,873
Deferred income taxes	(1,560)	(2,158)
Stock-based compensation	5,654	4,926
Changes in assets and liabilities:
Tuition receivable, net	(137)	245
Other current assets	409	(1,466)
Other assets	829	(2,639)
Accounts payable and accrued expenses	559	(726)
Income taxes payable and income taxes receivable	(3,153)	(3,314)
Deferred revenue	4,356	3,313
Other long-term liabilities	(3,187)	(4,380)
Net cash provided by operating activities	32,764	22,425
Cash flows from investing activities:
Purchases of property and equipment	(8,435)	(3,852)
Cash used in acquisition, net of cash acquired		(7,635)
Net cash used in investing activities	(8,435)	(11,487)
Cash flows from financing activities:
Payments of contingent consideration		(405)
Common dividends paid	(5,707)
Net cash used in financing activities	(5,707)	(405)
Net increase in cash and cash equivalents	18,622	10,533
Cash and cash equivalents - beginning of year	129,245	106,889
Cash and cash equivalents - end of year	147,867	117,422
Noncash transactions:
Purchases of property and equipment included in accounts payable	$ 469	$ 274