Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Revenue	$ 131,161	$ 125,542	$ 253,608	$ 241,298
Cost of revenue	108,726	105,198	211,785	203,027
Gross profit	22,435	20,344	41,823	38,271
Selling, general and administrative expenses	13,238	12,279	26,232	24,249
(Loss) gain on change in fair value of contingent consideration, net	(96)	88	101	(71)
Operating income	9,101	8,153	15,692	13,951
Interest expense	534	359	972	604
Other (expense) income	(107)	175	(182)	629
Income before income tax expense	8,460	7,969	14,538	13,976
Income tax expense	2,597	3,056	4,589	5,263
Net income	$ 5,863	$ 4,913	$ 9,949	$ 8,713
Basic weighted average shares outstanding (in shares)	16,717	16,677	16,729	16,718
Diluted weighted average shares outstanding (in shares)	16,833	16,768	16,837	16,799
Per common share data:
Basic earnings per share (in dollars per share)	$ 0.35	$ 0.29	$ 0.59	$ 0.52
Diluted earnings per share (in dollars per share)	$ 0.35	$ 0.29	$ 0.59	$ 0.52