Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Revenue	$ 278,648	$ 236,943	$ 579,378	$ 514,398
Operating expenses	236,934	209,016	460,905	408,843
Gross margin	41,714	27,927	118,473	105,555
Corporate general and administrative expenses	13,816	11,160	28,299	21,649
Legal settlement, net	30,468	0	30,468	0
Operating (loss) income	(2,570)	16,767	59,706	83,906
Other income (expense):
Interest expense	(959)	(2,074)	(1,836)	(3,193)
Gain on sale of operations, net	(6,385)	(57)	(6,385)	(152)
Other income (expense), net	8,373	13,336	13,162	(2,464)
Total other income (expense), net	13,799	11,319	17,711	(5,505)
Income from continuing operations before income tax    expense	11,229	28,086	77,417	78,401
Income tax expense	2,616	6,607	18,588	20,060
Income from continuing operations	8,613	21,479	58,829	58,341
Loss from discontinued operations, net of tax	(6)	(11)	(13)	(25)
Net income	$ 8,607	$ 21,468	$ 58,816	$ 58,316
Basic:
Continuing operations (in dollars per share)	$ 0.16	$ 0.40	$ 1.11	$ 1.07
Discontinued operations (in dollars per share)	0	0	0	0
Net income (in dollars per share)	0.16	0.40	1.11	1.07
Diluted:
Continuing operations (in dollars per share)	0.16	0.39	1.09	1.05
Discontinued operations (in dollars per share)	0	0	0	0
Net income (in dollars per share)	$ 0.16	$ 0.39	$ 1.09	$ 1.05
Basic weighted average shares outstanding (in shares)	52,874	54,142	53,119	54,356
Diluted weighted average shares outstanding (in shares)	53,769	55,116	54,109	55,515
Comprehensive income:
Net income	$ 8,607	$ 21,468	$ 58,816	$ 58,316
Other comprehensive income (loss), net of tax	58	(377)	912	(1,629)
Comprehensive income	$ 8,665	$ 21,091	$ 59,728	$ 56,687