CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenues:
Total revenues	$ 5,166,605	$ 3,805,566	$ 3,144,097
Cost of revenues: (exclusive of items shown separately below)
Total cost of revenues	3,543,930	2,609,837	2,137,751
Selling, general and administrative expenses	627,391	537,962	451,044
Accretion of environmental liabilities	12,943	11,745	11,051
Depreciation and amortization	347,594	298,135	292,915
Income from operations	634,747	347,887	251,336
Other income (expense), net	2,472	(515)	(290)
Loss on early extinguishment of debt	(422)	0	0
Gain (loss) on sale of businesses	8,864	0	(3,376)
Interest expense, net of interest income of $4,607, $2,218 and $3,462, respectively	(107,663)	(77,657)	(73,120)
Income from operations before provision for income taxes	537,998	269,715	174,550
Provision for income taxes	126,254	66,468	39,713
Net income	$ 411,744	$ 203,247	$ 134,837
Earnings per share:
Basic (in dollars per share)	$ 7.59	$ 3.73	$ 2.43
Diluted (in dollars per share)	$ 7.56	$ 3.71	$ 2.42
Shares used to compute earnings per share — Basic (in shares)	54,223	54,514	55,479
Shares used to compute earnings per share — Diluted (in shares)	54,487	54,761	55,690
Service revenues
Revenues:
Total revenues	$ 4,133,184	$ 3,048,019	$ 2,724,584
Cost of revenues: (exclusive of items shown separately below)
Total cost of revenues	2,892,726	2,105,043	1,786,718
Product revenues
Revenues:
Total revenues	1,033,421	757,547	419,513
Cost of revenues: (exclusive of items shown separately below)
Total cost of revenues	$ 651,204	$ 504,794	$ 351,033