CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
CONSOLIDATED STATEMENTS OF OPERATIONS
Revenues	$ 330,417	$ 459,601	$ 1,222,943	$ 1,119,732
Cost of revenues (exclusive of depreciation and amortization shown separately below)	239,084	309,790	810,120	779,544
Selling, general and administrative expenses	42,012	38,243	127,813	110,362
Pension settlement charges			18,286
Depreciation and amortization	28,388	20,941	78,716	60,501
Gain on disposition of assets, net	(1,778)	(1,543)	(7,729)	(6,295)
Operating income	22,711	92,170	195,737	175,620
Interest expense	(101)	(143)	(246)	(543)
Interest income	1,450	329	6,003	472
Other income (expense), net	804	(67)	2,196	516
Income before income taxes	24,864	92,289	203,690	176,065
Income tax provision	6,547	22,949	48,836	44,707
Net income	$ 18,317	$ 69,340	$ 154,854	$ 131,358
Earnings per share
Basic (in dollars per share)	$ 0.08	$ 0.32	$ 0.71	$ 0.61
Diluted (in dollars per share)	0.08	0.32	0.71	0.61
Dividends paid per share (in dollars per share)	$ 0.04	$ 0.02	$ 0.12	$ 0.02