Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Consolidated Statements of Operations
Net revenues	$ 138,525	$ 129,790	$ 111,989
Operating Expenses:
Cost of revenues	41,293	41,189	36,450
Selling, general and administrative	38,333	36,037	31,608
Depreciation and amortization	16,608	17,218	16,552
Other expenses	2,262	446	1,282
Loss on disposition of assets	6	33	70
Total operating expenses	98,502	94,923	85,962
Operating income	40,023	34,867	26,027
Other Expenses:
Interest expense, net	(11,651)	(12,086)	(11,925)
Loss on extinguishment of debt			(1,116)
Total other expenses	(11,651)	(12,086)	(13,041)
Income before income taxes	28,372	22,781	12,986
Income tax expense	(10,372)	(9,042)	(2,429)
Net income	$ 18,000	$ 13,739	$ 10,557
Earnings per share:
Basic (in dollars per share)	$ 0.43	$ 0.32	$ 0.25
Diluted (in dollars per share)	$ 0.43	$ 0.31	$ 0.25
Weighted average shares outstanding:
Basic (in shares)	41,666	42,840	42,321
Diluted (in shares)	42,274	43,802	42,622