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Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Consolidated Statements of Comprehensive Loss [Abstract]
Net loss	$ (86,098)	$ (75,238)
Other comprehensive income net of tax:
Pension liability adjustments, net of tax	(983)	(476)
Postretirement liability adjustments, net of tax		(2,116)
Other comprehensive income	(983)	(2,592)
Comprehensive loss	$ (87,081)	$ (77,830)

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The adjustment out of other comprehensive income for prior service costs recognized as a component of net period benefit cost during the period, after tax. Also includes actuarial gains/losses recognized out of OCI in addition to prior service costs. This is the portion attributable to the pension liability.

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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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