Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Revenue	$ 124,097	$ 121,978	$ 377,705	$ 363,276
Cost of revenue	105,451	101,974	317,236	305,001
Gross profit	18,646	20,004	60,469	58,275
Selling, general and administrative expenses	14,553	11,996	40,785	36,245
Gain (loss) on change in fair value of contingent consideration, net	268	(3)	369	(74)
Operating income	4,361	8,005	20,053	21,956
Interest expense	511	366	1,483	970
Other income (expense)	74	(28)	(108)	601
Income before income tax expense	3,924	7,611	18,462	21,587
Income tax expense	643	2,809	5,232	8,072
Net income	$ 3,281	$ 4,802	$ 13,230	$ 13,515
Basic weighted average shares outstanding (in shares)	16,750	16,646	16,736	16,694
Diluted weighted average shares outstanding (in shares)	16,896	16,747	16,856	16,800
Per common share data:
Basic earnings per share (in dollars per share)	$ 0.20	$ 0.29	$ 0.79	$ 0.81
Diluted earnings per share (in dollars per share)	$ 0.19	$ 0.29	$ 0.78	$ 0.80