UNAUDITED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Revenues:
Total revenues	$ 1,431,950	$ 1,376,695
Cost of revenues: (exclusive of items shown separately below)
Total cost of revenues	1,021,884	971,070
Selling, general and administrative expenses	182,847	181,868
Accretion of environmental liabilities	3,620	3,217
Depreciation and amortization	111,980	95,065
Income from operations	111,619	125,475
Other expense, net	(932)	(1,141)
Interest expense, net of interest income of $5,628 and $3,514, respectively	(36,077)	(28,539)
Income before provision for income taxes	74,610	95,795
Provision for income taxes	15,930	25,963
Net income	$ 58,680	$ 69,832
Earnings per share:
Basic (in dollars per share)	$ 1.09	$ 1.29
Diluted (in dollars per share)	$ 1.09	$ 1.29
Shares used to compute earnings per share - Basic (in shares)	53,759	53,930
Shares used to compute earnings per share - Diluted (in shares)	53,993	54,213
Service revenues
Revenues:
Total revenues	$ 1,201,454	$ 1,151,858
Cost of revenues: (exclusive of items shown separately below)
Total cost of revenues	839,744	816,349
Product revenues
Revenues:
Total revenues	230,496	224,837
Cost of revenues: (exclusive of items shown separately below)
Total cost of revenues	$ 182,140	$ 154,721