Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenues	$ 215,828	$ 195,615	$ 413,029	$ 391,046
Total cost of sales (excluding depreciation and amortization)	110,065	88,877	203,204	176,025
Selling, general and administrative	27,691	26,077	55,464	51,161
Depreciation and amortization	41,356	44,193	84,395	89,905
Long-lived and other asset impairment	4,647	2,960	12,063	10,033
Restructuring charges		743		1,640
Interest expense	24,456	25,958	49,702	57,203
Gain on sale of assets, net	(18,948)	(3,124)	(21,060)	(14,156)
Other income, net	497	(82)	533	(1,971)
Income before income taxes	26,064	10,013	28,728	21,206
Provision for income taxes	9,318	1,261	10,261	8,285
Net income	$ 16,746	$ 8,752	$ 18,467	$ 12,921
Basic net income per common share (in dollars per share)	$ 0.11	$ 0.06	$ 0.12	$ 0.08
Diluted net income per common share (in dollars per share)	$ 0.11	$ 0.06	$ 0.12	$ 0.08
Weighted average common shares outstanding:
Basic (in shares)	153,033	152,033	152,857	151,537
Diluted (in shares)	153,164	152,203	152,982	151,699
Contract Operations
Revenues	$ 166,298	$ 163,865	$ 329,954	$ 329,899
Total cost of sales (excluding depreciation and amortization)	68,355	61,387	132,856	122,752
Aftermarket Services
Revenues	49,530	31,750	83,075	61,147
Total cost of sales (excluding depreciation and amortization)	$ 41,710	$ 27,490	$ 70,348	$ 53,273