CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue:
Revenues	$ 220,316	$ 238,390	$ 470,013	$ 474,549
Total cost of sales (excluding depreciation and amortization)	92,076	112,736	205,718	231,373
Selling, general and administrative	28,745	28,618	59,371	57,607
Depreciation and amortization	48,849	45,482	98,671	89,588
Long-lived asset impairment	55,210	8,632	61,405	11,724
Goodwill impairment			99,830
Restatement and other charges		24		445
Restructuring costs	2,408		4,136
Interest expense	25,778	25,954	55,443	49,571
Debt extinguishment loss	3,971	3,653	3,971	3,653
Transaction-related costs		2,687		2,867
(Gain) loss on sale of assets, net	2,189	(1,801)	(1,927)	(1,785)
Other income, net	(438)	(209)	(993)	(430)
Income (loss) before income taxes	(38,472)	12,614	(115,612)	29,936
Provision for (benefit from) income taxes	(8,091)	1,191	(24,044)	(1,216)
Income (loss) from continuing operations	(30,381)	11,423	(91,568)	31,152
Loss from discontinued operations, net of tax				(273)
Net income (loss)	$ (30,381)	$ 11,423	$ (91,568)	$ 30,879
Basic and diluted net income (loss) per common share (in dollars per share)	$ (0.20)	$ 0.09	$ (0.61)	$ 0.24
Weighted average common shares outstanding:
Basic (in shares)	150,743	128,328	150,628	128,261
Diluted (in shares)	150,743	128,354	150,628	128,297
Contract Operations
Revenue:
Revenues	$ 187,949	$ 186,258	$ 394,923	$ 368,765
Total cost of sales (excluding depreciation and amortization)	63,390	70,521	142,041	145,256
Aftermarket Services
Revenue:
Revenues	32,367	52,132	75,090	105,784
Total cost of sales (excluding depreciation and amortization)	$ 28,686	$ 42,215	$ 63,677	$ 86,117