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Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
Net loss	$ (25,847)	$ (39,132)
Other comprehensive income net of tax:
Pension and postretirement liability adjustments, net of tax	84	156
Comprehensive income (loss)	$ (25,763)	$ (38,976)

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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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