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Segments - Reconciliation of Net Income to Gross Margin (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Reconciliation Net Income (Loss) to Gross Margin
Total gross margin	$ 103,234	$ 119,478		$ 318,255	$ 383,773
Less:
Selling, general and administrative	28,839	18,681		80,000	78,052
Depreciation and amortization	45,280	47,279		135,185	145,950
Long-lived and other asset impairment	5,121	10,727		15,154	72,132
Goodwill impairment			$ 99,800		99,830
Restructuring charges	313	2,900		1,953	7,036
Interest expense	25,508	25,221		82,711	80,664
Debt extinguishment loss					3,971
(Gain) loss on sale of assets, net	(15,393)	(9,146)		(29,549)	(11,073)
Other (income) expense, net	337	(324)		(1,634)	(1,317)
Income (loss) before income taxes	$ 13,229	$ 24,140		$ 34,435	$ (91,472)

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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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