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Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Condensed Consolidated Statements of Comprehensive Loss [Abstract]
Net loss	$ (38,379)	$ (17,163)
Other comprehensive income net of tax:
Pension and postretirement liability adjustments, net of tax	156	141
Comprehensive loss	$ (38,223)	$ (17,022)

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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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