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Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Condensed Consolidated Statements of Comprehensive Loss [Abstract]
Net loss	$ (41,313)	$ (35,729)	$ (71,456)	$ (65,648)
Other comprehensive income net of tax:
Pension and postretirement liability adjustments, net of tax	140	44	421	131
Other comprehensive income	140	44	421	131
Comprehensive loss	$ (41,173)	$ (35,685)	$ (71,035)	$ (65,517)

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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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Amount after tax of income (loss) from continuing operations including portion attributable to the noncontrolling interest.

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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