UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Statement [Abstract]
Net service revenues	$ 341,575	$ 313,810	$ 991,539	$ 898,592
Direct costs of services	231,754	215,519	680,940	622,389
Gross profit	109,821	98,291	310,599	276,203
Selling, general and administrative expenses	84,167	82,090	249,714	234,218
Depreciation and amortization	2,579	2,642	7,402	7,391
Income from operations	23,075	13,559	53,483	34,594
Other expense, net	463	218	1,907	1,025
Income from continuing operations, before income taxes	22,612	13,341	51,576	33,569
Income tax expense	9,067	5,346	20,653	13,232
Income from continuing operations	13,545	7,995	30,923	20,337
Income from discontinued operations, net of income taxes	0	57,023	0	61,633
Net income	13,545	65,018	30,923	81,970
Other comprehensive income (loss):
Defined benefit pension and post-retirement plans, net of tax	1	(172)	3	(205)
Comprehensive income	$ 13,546	$ 64,846	$ 30,926	$ 81,765
Earnings per share – basic:
From continuing operations (in dollars per share)	$ 0.49	$ 0.26	$ 1.10	$ 0.63
From discontinued operations (in dollars per share)	0.00	1.81	0.00	1.91
Earnings per share – basic (in dollars per share)	0.49	2.07	1.10	2.54
Earnings per share – diluted:
From continuing operations (in dollars per share)	0.48	0.25	1.09	0.63
From discontinued operations (in dollars per share)	0.00	1.81	0.00	1.89
Earnings per share – diluted (in dollars per share)	$ 0.48	$ 2.06	$ 1.09	$ 2.52
Weighted average shares outstanding – basic (in shares)	27,811	31,347	28,072	32,267
Weighted average shares outstanding – diluted (in shares)	28,132	31,553	28,318	32,495
Dividends declared per share (in dollars per share)	$ 0.11	$ 0.10	$ 0.33	$ 0.30