CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues:
Services	$ 386,668	$ 326,589	$ 286,548
Software and hardware	52,776	30,224	25,188
Reimbursable expenses	17,248	16,512	15,360
Total revenues	456,692	373,325	327,096
Cost of revenues (exclusive of depreciation and amortization, shown separately below)
Project personnel costs	239,862	202,897	182,719
Software and hardware costs	47,235	26,648	21,536
Reimbursable expenses	17,248	16,512	15,360
Other project-related expenses	3,012	4,169	4,078
Total cost of revenues	307,357	250,226	223,693
Gross margin	149,335	123,099	103,403
Selling, general, and administrative	90,202	77,601	64,853
Depreciation	3,734	3,262	2,251
Amortization	14,453	7,974	7,827
Acquisition costs	3,446	2,297	1,871
Adjustment to fair value of contingent consideration	(1,463)	287	517
Income from operations	38,963	31,678	26,084
Net interest expense	(1,438)	(293)	(143)
Net other (expense) income	(5)	112	44
Income before income taxes	37,520	31,497	25,985
Provision for income taxes	14,357	10,065	9,878
Net income	$ 23,163	$ 21,432	$ 16,107
Basic net income per share (in dollars per share)	$ 0.73	$ 0.71	$ 0.54
Diluted net income per share (in dollars per share)	$ 0.70	$ 0.67	$ 0.52
Shares used in computing basic net income per share (in shares)	31,698	30,294	29,536
Shares used in computing diluted net income per share (in shares)	33,158	31,808	31,086