UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Revenue	$ 326,738	$ 317,441
Direct costs	233,562	224,904
Gross profit	93,176	92,537
Selling, general and administrative expenses	79,813	78,797
Depreciation and amortization	1,650	1,751
Income from operations	11,713	11,989
Other expense, net	923	1,344
Income from continuing operations, before income taxes	10,790	10,645
Income tax expense	2,816	2,660
Income from continuing operations	7,974	7,985
Income from discontinued operations, net of tax	18,881	1,190
Net income	26,855	9,175
Other comprehensive (loss) income:
Change in fair value of interest rate swap, net of tax	(280)
Change in fair value of interest rate swap, net of tax		517
Comprehensive income	$ 26,575	$ 9,692
Earnings per share – basic:
Continuing operations (in dollars per share)	$ 0.33	$ 0.32
Discontinued operations (in dollars per share)	0.77	0.05
Earnings per share - basic (in dollars per share)	1.10	0.37
Earnings per share – diluted:
Continuing operations (in dollars per share)	0.32	0.32
Discontinued operations (in dollars per share)	0.75	0.05
Earnings per share – diluted (in dollars per share)	$ 1.07	$ 0.37
Weighted average shares outstanding – basic (in shares)	24,516	24,804
Weighted average shares outstanding – diluted (in shares)	25,019	25,094