Unaudited Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenues	$ 213,668	$ 195,166	$ 626,697	$ 586,212
Total cost of sales (excluding depreciation and amortization)	107,527	91,932	310,731	267,957
Selling, general and administrative	30,500	28,839	85,964	80,000
Depreciation and amortization	39,953	45,280	124,348	135,185
Long-lived and other asset impairment	4,154	5,121	16,217	15,154
Restructuring charges		313		1,953
Interest expense	25,177	25,508	74,879	82,711
Gain on sale of assets, net	(12,695)	(15,393)	(33,755)	(29,549)
Other (income) expense, net	(585)	337	(52)	(1,634)
Income before income taxes	19,637	13,229	48,365	34,435
Provision for income taxes	4,266	3,925	14,527	12,210
Net income	$ 15,371	$ 9,304	$ 33,838	$ 22,225
Basic earnings per common share (in dollars per share)	$ 0.10	$ 0.06	$ 0.21	$ 0.14
Diluted earnings per common share(in dollars per share)	$ 0.10	$ 0.06	$ 0.21	$ 0.14
Weighted average common shares outstanding:
Basic (in shares)	153,550	152,158	153,168	151,615
Diluted (in shares)	153,687	152,297	153,297	151,769
Contract Operations
Revenues	$ 170,497	$ 158,911	$ 500,451	$ 488,810
Total cost of sales (excluding depreciation and amortization)	71,694	61,280	204,550	184,032
Aftermarket Services
Revenues	43,171	36,255	126,246	97,402
Total cost of sales (excluding depreciation and amortization)	$ 35,833	$ 30,652	$ 106,181	$ 83,925