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Segment Information - Reconciliation of gross margin to income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Reconciliation of total gross margin to income
Total gross margin	$ 116,444	$ 104,062
Less:
Selling, general and administrative	26,425	27,773
Depreciation and amortization	40,181	43,039
Long-lived and other asset impairment	2,569	7,416
Restructuring charges	1,047
Interest expense	26,581	25,246
Gain on sale of assets, net	(3,605)	(2,112)
Other expense (income), net	603	36
Income before income taxes	$ 22,643	$ 2,664

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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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