CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues:
Services	$ 434,253	$ 418,589	$ 411,469
Software and hardware	38,642	49,954	46,622
Reimbursable expenses	12,366	18,439	15,530
Total revenues	485,261	486,982	473,621
Cost of revenues (exclusive of depreciation and amortization, shown separately below)
Cost of services	278,087	273,682	261,711
Software and hardware costs	33,295	43,581	41,170
Reimbursable expenses	12,366	18,439	15,530
Total cost of revenues	323,748	335,702	318,411
Selling, general, and administrative	108,192	101,264	99,963
Depreciation	4,722	4,867	4,496
Amortization	15,025	13,371	13,819
Acquisition costs	1,359	1,252	1,235
Adjustment to fair value of contingent consideration	3,235	(1,679)	445
Income from operations	28,980	32,205	35,252
Net interest expense	1,838	1,636	2,085
Net other (income) expense	(1)	60	332
Income before income taxes	27,143	30,509	32,835
Provision for income taxes	8,562	10,050	9,828
Net income	$ 18,581	$ 20,459	$ 23,007
Basic net income per share (in dollars per share)	$ 0.56	$ 0.60	$ 0.69
Diluted net income per share (in dollars per share)	$ 0.55	$ 0.58	$ 0.67
Shares used in computing basic net income per share (in shares)	33,016	34,023	33,408
Shares used in computing diluted net income per share (in shares)	34,066	35,001	34,324