Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement of Comprehensive Income [Abstract]
Revenue	$ 454,606	$ 391,722
Operating expenses	341,011	290,299
Gross margin	113,595	101,423
Corporate general and administrative expenses	15,598	16,309
Operating income	97,997	85,114
Other income (expense):
Interest expense	(3,641)	(1,259)
Gain on sale of operations, net	99	0
Other income (expense), net	5,112	(6,407)
Total other income (expense), net	1,570	(7,666)
Income before income tax expense	99,567	77,448
Income tax expense	26,407	19,321
Net income	$ 73,160	$ 58,127
Earnings per share:
Basic (in dollars per share)	$ 1.45	$ 1.12
Diluted (in dollars per share)	$ 1.44	$ 1.10
Basic weighted average shares outstanding (in shares)	50,367	52,119
Diluted weighted average shares outstanding (in shares)	50,762	52,955
Comprehensive income:
Net income	$ 73,160	$ 58,127
Other comprehensive (loss) income, net of tax	(1,213)	1,925
Comprehensive income	$ 71,947	$ 60,052