Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Statement [Abstract]
Revenue	$ 123,869	$ 113,197	$ 376,667	$ 319,469
Cost of revenue	101,351	93,136	311,027	264,832
Gross profit	22,518	20,061	65,640	54,637
Selling, general and administrative expenses	11,863	9,856	34,914	28,825
Gain on change in fair value of contingent consideration, net	655	135	1,513	427
Operating income	11,310	10,340	32,239	26,239
Interest expense	117	90	399	256
Other income (expense)	(72)	4	185	326
Income before income tax expense	11,121	10,254	32,025	26,309
Income tax expense	3,877	4,111	12,351	9,994
Net income	$ 7,244	$ 6,143	$ 19,674	$ 16,315
Basic weighted average shares outstanding (in shares)	19,131	19,125	19,138	19,089
Diluted weighted average shares outstanding (in shares)	19,391	19,404	19,409	19,344
Per common share data:
Basic earnings per share (in dollars per share)	$ 0.38	$ 0.32	$ 1.03	$ 0.85
Diluted earnings per share (in dollars per share)	$ 0.37	$ 0.32	$ 1.01	$ 0.84