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Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Consolidated Statements of Comprehensive Loss [Abstract]
Net loss	$ (41,447)	$ (86,098)
Other comprehensive income net of tax:
Pension and postretirement liability adjustments, net of tax	6,241	(983)
Comprehensive loss	$ (35,206)	$ (87,081)

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Pension And Postretirement Liability Activity

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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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