Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Statement of Comprehensive Income [Abstract]
Revenue	$ 398,502	$ 361,952	$ 853,108	$ 753,674
Operating expenses	343,987	289,736	684,998	580,035
Gross margin	54,515	72,216	168,110	173,639
Corporate general and administrative expenses	15,793	10,926	31,391	27,235
Operating income	38,722	61,290	136,719	146,404
Other (expense) income:
Interest expense	(5,534)	(1,645)	(9,175)	(2,904)
Gain on sale of operations, net	0	135	99	135
Other income (expense), net	5,421	(15,903)	10,533	(22,310)
Total other (expense) income, net	(113)	(17,413)	1,457	(25,079)
Income before income tax expense	38,609	43,877	138,176	121,325
Income tax expense	11,746	12,622	38,153	31,943
Net income	$ 26,863	$ 31,255	$ 100,023	$ 89,382
Earnings per share:
Basic (in dollars per share)	$ 0.54	$ 0.60	$ 1.99	$ 1.72
Diluted (in dollars per share)	$ 0.53	$ 0.60	$ 1.98	$ 1.70
Basic weighted average shares outstanding (in shares)	49,963	51,911	50,164	52,015
Diluted weighted average shares outstanding (in shares)	50,385	52,531	50,639	52,736
Comprehensive income:
Net income	$ 26,863	$ 31,255	$ 100,023	$ 89,382
Other comprehensive income, net of tax	1,537	480	324	2,405
Comprehensive income	$ 28,400	$ 31,735	$ 100,347	$ 91,787