CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenues:
Total revenues	$ 5,889,952	$ 5,409,152	$ 5,166,605
Cost of revenues: (exclusive of items shown separately below)
Total cost of revenues	4,065,713	3,746,124	3,543,930
Selling, general and administrative expenses	739,629	671,161	627,391
Accretion of environmental liabilities	13,456	13,667	12,943
Depreciation and amortization	400,922	365,761	347,594
Income from operations	670,232	612,439	634,747
Other (expense) income, net	(1,454)	2,315	2,472
Loss on early extinguishment of debt	(371)	(2,880)	(422)
Gain on sale of business	0	0	8,864
Interest expense, net of interest income of $19,437, $11,930 and $4,607, respectively	(134,964)	(108,595)	(107,663)
Income before provision for income taxes	533,443	503,279	537,998
Provision for income taxes	131,144	125,423	126,254
Net income	$ 402,299	$ 377,856	$ 411,744
Earnings per share:
Basic (in dollars per share)	$ 7.46	$ 6.99	$ 7.59
Diluted (in dollars per share)	$ 7.42	$ 6.95	$ 7.56
Shares used to compute earnings per share — Basic (in shares)	53,902	54,071	54,223
Shares used to compute earnings per share — Diluted (in shares)	54,199	54,382	54,487
Service revenues
Revenues:
Total revenues	$ 4,928,023	$ 4,449,542	$ 4,133,184
Cost of revenues: (exclusive of items shown separately below)
Total cost of revenues	3,370,231	3,054,594	2,892,726
Product revenues
Revenues:
Total revenues	961,929	959,610	1,033,421
Cost of revenues: (exclusive of items shown separately below)
Total cost of revenues	$ 695,482	$ 691,530	$ 651,204