Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenue	$ 113,197	$ 99,671	$ 319,469	$ 295,587
Cost of revenue	93,136	81,742	264,832	243,041
Gross profit	20,061	17,929	54,637	52,546
Selling, general and administrative expenses	9,856	8,890	28,825	26,220
Gain (loss) on change in fair value of contingent consideration, net	135	(792)	427	(863)
Operating income	10,340	8,247	26,239	25,463
Interest expense	90	75	256	175
Other income	4	72	326	262
Income before income tax expense	10,254	8,244	26,309	25,550
Income tax expense	4,111	2,061	9,994	8,999
Net income	$ 6,143	$ 6,183	$ 16,315	$ 16,551
Basic weighted average shares outstanding (in shares)	19,125	19,009	19,089	18,912
Diluted weighted average shares outstanding (in shares)	19,404	19,328	19,344	19,255
Per common share data:
Basic earnings per share (in dollars per share)	$ 0.32	$ 0.33	$ 0.85	$ 0.88
Diluted earnings per share (in dollars per share)	$ 0.32	$ 0.32	$ 0.84	$ 0.86