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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (UNAUDITED) (in thousands) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net loss	$ (251,269)	$ (411,895)
Other comprehensive income, net of tax:
Pension liability adjustment	191	190
Total other comprehensive income, net of tax	191	190
Total comprehensive loss	$ (251,078)	$ (411,705)

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