Consolidated Statements of Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Revenue	$ 1,411,979	$ 1,104,925	$ 963,897
Operating expenses	1,188,612	945,635	825,351
Gross margin	223,367	159,290	138,546
Corporate general and administrative expenses	55,023	56,150	46,066
Legal settlement, net	0	30,468	0
Operating income (loss)	168,344	72,672	92,480
Other (expense) income:
Interest expense	(8,039)	(3,868)	(4,983)
Gain (loss) on sale of operations, net	413	5,995	(509)
Other (expense) income, net	(19,225)	18,241	16,500
Total other (expense) income, net	(26,851)	20,368	11,008
Income from continuing operations before income tax expense	141,493	93,040	103,488
Income tax expense	36,121	22,129	25,141
Income from continuing operations	105,372	70,911	78,347
Loss from operations of discontinued operations, net of tax	(18)	(24)	(48)
Net income	$ 105,354	$ 70,887	$ 78,299
Earnings Per Share:
Continuing operations (in dollars per share)	$ 2.05	$ 1.35	$ 1.44
Discontinued operations (in dollars per share)	0	0	0
Net income (loss) (in dollars per share)	2.05	1.35	1.44
Diluted:
Continuing operations (in dollars per share)	2.01	1.32	1.42
Discontinued operations (in dollars per share)	0	0	(0.01)
Net income (loss) (in dollars per share)	$ 2.01	$ 1.32	$ 1.41
Basic weighted average common shares outstanding (in shares)	51,502	52,637	54,288
Diluted weighted average common shares outstanding (in shares)	52,388	53,723	55,359
Comprehensive income:
Net income	$ 105,354	$ 70,887	$ 78,299
Other comprehensive income (loss):
Net unrealized loss on available-for-sale securities, net of income tax benefit of $520, $179 and $14	(1,391)	(478)	(42)
Net unrealized gain (loss) on interest rate swaps, net of income tax expense (benefit) of $1,965, $577 and $(494)	5,986	1,799	(1,525)
Foreign currency translation	(24)	(19)	(22)
Total other comprehensive income (loss)	4,571	1,302	(1,589)
Total comprehensive income	$ 109,925	$ 72,189	$ 76,710