Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Revenue	$ 410,539	$ 363,262	$ 1,263,647	$ 1,116,936
Operating expenses	342,148	306,017	1,027,146	886,052
Gross margin	68,391	57,245	236,501	230,884
Corporate general and administrative expenses	13,136	15,893	44,527	43,128
Operating income	55,255	41,352	191,974	187,756
Other (expense) income:
Interest expense	(5,848)	(2,305)	(15,023)	(5,209)
Gain on sale of operations, net	77	176	176	311
Other (expense) income, net	(2,288)	(2,622)	8,245	(24,932)
Total other expense, net	(8,059)	(4,751)	(6,602)	(29,830)
Income before income tax expense	47,196	36,601	185,372	157,926
Income tax expense	13,514	9,131	51,667	41,074
Net income	$ 33,682	$ 27,470	$ 133,705	$ 116,852
Earnings per share:
Basic (in dollars per share)	$ 0.68	$ 0.53	$ 2.67	$ 2.25
Diluted (in dollars per share)	$ 0.67	$ 0.53	$ 2.64	$ 2.22
Basic weighted average shares outstanding (in shares)	49,838	51,457	50,054	51,827
Diluted weighted average shares outstanding (in shares)	50,371	52,238	50,644	52,720
Comprehensive income:
Net income	$ 33,682	$ 27,470	$ 133,705	$ 116,852
Other comprehensive income, net of tax	487	2,179	811	4,584
Comprehensive income	$ 34,169	$ 29,649	$ 134,516	$ 121,436