CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues	$ 205,631	$ 244,949	$ 675,644	$ 719,498
Total cost of sales (excluding depreciation and amortization)	86,153	113,566	291,871	344,939
Selling, general and administrative	18,681	29,526	78,052	87,133
Depreciation and amortization	47,279	48,409	145,950	137,997
Long-lived and other asset impairment	10,727	7,097	72,132	18,821
Goodwill impairment		0	99,830	0
Restatement and other charges		0		445
Restructuring charges	2,900	0	7,036	0
Interest expense	25,221	27,401	80,664	76,972
Debt extinguishment loss		0	3,971	3,653
Transaction-related costs		4,905		7,772
Gain on sale of assets, net	(9,146)	(7,859)	(11,073)	(9,644)
Other (income) loss, net	(324)	49	(1,317)	(381)
Income (loss) before income taxes	24,140	21,855	(91,472)	51,791
Provision for (benefit from) income taxes	5,808	1,448	(18,236)	232
Income (loss) from continuing operations	18,332	20,407	(73,236)	51,559
Loss from discontinued operations, net of tax		0		(273)
Net income (loss)	$ 18,332	$ 20,407	$ (73,236)	$ 51,286
Basic and diluted net income (loss) per common share (in dollars per share)	$ 0.12	$ 0.14	$ (0.49)	$ 0.38
Weighted average common shares outstanding:
Basic (in shares)	150,974	142,931	150,730	133,170
Diluted (in shares)	151,038	142,965	150,730	133,206
Contract Operations
Revenues	$ 175,223	$ 198,337	$ 570,146	$ 567,102
Total cost of sales (excluding depreciation and amortization)	60,444	75,941	202,485	221,197
Aftermarket Services
Revenues	30,408	46,612	105,498	152,396
Total cost of sales (excluding depreciation and amortization)	$ 25,709	$ 37,625	$ 89,386	$ 123,742