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Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 731	$ (41,313)	$ (42,612)	$ (71,456)
Other comprehensive income net of tax:
Pension and postretirement liability adjustments, net of tax	155	140	467	421
Comprehensive income (loss)	$ 886	$ (41,173)	$ (42,145)	$ (71,035)

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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