Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
Revenue	$ 494,297	$ 454,606
Operating expenses	376,485	341,011
Gross margin	117,812	113,595
Corporate general and administrative expenses	18,711	15,598
Operating income	99,101	97,997
Other (expense) income:
Interest expense	(4,511)	(3,641)
Gain on sale of operations, net	0	99
Other income, net	9,424	5,112
Total other income, net	4,913	1,570
Income before income tax expense	104,014	99,567
Income tax expense	27,130	26,407
Net Income	$ 76,884	$ 73,160
Earnings per share:
Basic (in dollars per share)	$ 1.54	$ 1.45
Diluted (in dollars per share)	$ 1.53	$ 1.44
Basic weighted average shares outstanding (in shares)	50,045	50,367
Diluted weighted average shares outstanding (in shares)	50,221	50,762
Comprehensive income:
Net income	$ 76,884	$ 73,160
Other comprehensive income (loss), net of tax	1,018	(1,213)
Comprehensive income	$ 77,902	$ 71,947