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Segments - Reconciliation of Net Income to Gross Margin (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Reconciliation Net Income (Loss) to Gross Margin
Total gross margin	$ 106,738	$ 128,240		$ 215,021	$ 264,295
Less:
Selling, general and administrative	26,077	28,745		51,161	59,371
Depreciation and amortization	44,193	48,849		89,905	98,671
Long-lived and other asset impairment	2,960	55,210		10,033	61,405
Goodwill impairment			$ 99,800		99,830
Restructuring charges	743	2,408		1,640	4,136
Interest expense	25,958	25,778		57,203	55,443
Debt extinguishment loss		3,971			3,971
(Gain) loss on sale of assets, net	(3,124)	2,189		(14,156)	(1,927)
Other income, net	(82)	(438)		(1,971)	(993)
Income (loss) before income taxes	$ 10,013	$ (38,472)		$ 21,206	$ (115,612)

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity, excluding depreciation and amortization expense. Gross margin is a non-GAAP financial measure.

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