UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Revenue	$ 343,020	$ 338,861	$ 678,228	$ 665,599
Direct costs	245,659	237,835	486,343	471,397
Gross profit	97,361	101,026	191,885	194,202
Selling, general and administrative expenses	80,546	78,017	159,762	157,830
Depreciation and amortization	1,380	1,542	2,773	3,192
Income from operations	15,435	21,467	29,350	33,180
Other expense, net	1,427	403	2,808	1,326
Income from continuing operations, before income taxes	14,008	21,064	26,542	31,854
Income tax expense	4,123	4,988	7,551	7,804
Income from continuing operations	9,885	16,076	18,991	24,050
Income from discontinued operations, net of tax	0	58,783	0	77,664
Net income	9,885	74,859	18,991	101,714
Other comprehensive loss:
Change in fair value of interest rate swaps, net of tax	(470)	(478)	(1,591)	(758)
Comprehensive income	$ 9,415	$ 74,381	$ 17,400	$ 100,956
Earnings per share – basic:
Continuing operations (in dollars per share)	$ 0.48	$ 0.67	$ 0.90	$ 0.99
Discontinued operations (in dollars per share)	0	2.46	0	3.21
Earnings per share - basic (in dollars per share)	0.48	3.13	0.90	4.20
Earnings per share – diluted:
Continuing operations (in dollars per share)	0.47	0.66	0.89	0.97
Discontinued operations (in dollars per share)	0	2.40	0	3.14
Earnings per share – diluted (in dollars per share)	$ 0.47	$ 3.06	$ 0.89	$ 4.11
Weighted average shares outstanding – basic (in shares)	20,790	23,901	21,171	24,207
Weighted average shares outstanding – diluted (in shares)	21,078	24,458	21,469	24,745