Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating activities
Net income	$ 32,414	$ 40,877	$ 42,034
Adjustments to reconcile net income to net cash provided by operating activities, net of assets and liabilities acquired
Depreciation and amortization	20,520	16,121	13,508
Stock-based compensation	5,912	5,369	4,024
Loss on disposal	817	115	62
Investment loss/(income)	(90)	166	67
Stock issued for director compensation	66	90	104
Deferred income taxes	(160)	2,494	2,018
Changes in operating assets and liabilities:
Accounts receivable, net of allowance for bad debt	(1,787)	3,390	2,720
Prepaid expenses and other assets	(4,405)	(512)	(1,262)
Income tax receivable	2,029	1,186	1,738
Accounts payable	(4,765)	(534)	(5,903)
Accrued liabilities	738	(6,708)	5,047
Deferred revenue and student deposits	5,922	(1,024)	(4,743)
Net cash provided by operating activities	57,211	61,030	59,414
Investing activities
Capital expenditures	(26,002)	(24,596)	(20,649)
Equity investment	(3,871)	(1,620)	(4,000)
Note receivable	(199)	6,000	0
Acquisition, net of cash acquired	0	0	(44,356)
Capitalized program development costs and other assets	(1,265)	(1,075)	(244)
Net cash used in investing activities	(31,337)	(21,291)	(69,249)
Financing activities
Cash paid for repurchase of common/restricted stock	(35,310)	(19,711)	(14,423)
Cash received from issuance of common stock	55	536	3,312
Excess tax benefit/(expense) from stock-based compensation	(519)	250	865
Net cash used in financing activities	(35,774)	(18,925)	(10,246)
Net increase (decrease) in cash and cash equivalents	(9,900)	20,814	(20,081)
Cash and cash equivalents at beginning of period	115,634	94,820	114,901
Cash and cash equivalents at end of period	105,734	115,634	94,820
Supplemental disclosures of cash flow information
Income taxes paid	$ 18,037	$ 21,631	$ 21,014