Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income Statement [Abstract]
Revenue	$ 125,665	$ 134,918	$ 240,918	$ 252,798
Cost of revenue	105,589	110,151	201,707	209,676
Gross profit	20,076	24,767	39,211	43,122
Selling, general and administrative expenses	12,007	11,462	23,606	23,051
Gain (loss) on change in fair value of contingent consideration, net	(55)	481	(258)	858
Operating income	8,014	13,786	15,347	20,929
Interest expense	306	77	671	282
Other income (expense)	(310)	68	(535)	257
Income before income tax expense	7,398	13,777	14,141	20,904
Income tax expense	2,684	5,664	5,320	8,474
Net income	$ 4,714	$ 8,113	$ 8,821	$ 12,430
Basic weighted average shares outstanding (in shares)	17,178	19,144	17,169	19,142
Diluted weighted average shares outstanding (in shares)	17,354	19,415	17,334	19,418
Per common share data:
Basic earnings per share (in dollars per share)	$ 0.27	$ 0.42	$ 0.51	$ 0.65
Diluted earnings per share (in dollars per share)	$ 0.27	$ 0.42	$ 0.51	$ 0.64