UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Net service revenues	$ 333,992	$ 322,201
Direct costs of services	236,857	225,012
Gross profit	97,135	97,189
Selling, general and administrative expenses	84,678	85,455
Depreciation and amortization	2,050	2,327
Income from operations	10,407	9,407
Other expense, net	1,185	668
Income before income taxes	9,222	8,739
Income tax expense	3,320	5,089
Net income	5,902	3,650
Other comprehensive (loss) income:
Defined benefit pension plans, net of tax	(5)	(3)
Comprehensive income	$ 5,897	$ 3,647
Earnings per share – basic (in dollars per share)	$ 0.23	$ 0.14
Earnings per share – diluted (in dollars per share)	$ 0.23	$ 0.14
Weighted average shares outstanding – basic (in shares)	25,223	26,693
Weighted average shares outstanding – diluted (in shares)	25,509	26,842
Dividends declared per share (in dollars per share)	$ 0.12	$ 0.12