Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenue	$ 401,572	$ 333,167	$ 259,926
Cost of revenue	329,601	276,533	217,236
Gross profit	71,971	56,634	42,690
Selling, general and administrative expenses	35,500	30,249	23,466
Gain on reversal of deferred rent liability	0	1,041	0
Gain (loss) on change in fair value of contingent consideration, net	(789)	517	1,313
Operating income	35,682	27,943	20,537
Interest expense	269	209	236
Other income (including interest income of $29 in 2012, $57 in 2011 and $105 in 2010)	389	657	551
Income before income taxes	35,802	28,391	20,852
Income tax expense	13,114	10,531	8,120
Net income	$ 22,688	$ 17,860	$ 12,732
Basic weighted average shares outstanding (in shares)	18,956	18,766	18,621
Diluted weighted average shares outstanding (in shares)	19,275	19,010	18,729
Per common share data:
Basic earnings per share (in dollars per share)	$ 1.20	$ 0.95	$ 0.68
Diluted earnings per share (in dollars per share)	$ 1.18	$ 0.94	$ 0.68