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CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ (156,472)	$ (167,583)	$ (129,321)	$ (1,388)
Postretirement benefits:
Actuarial gain	0	0	0	7
Amortization of prior service costs	92	93	184	185
Income tax expense	(22)	(22)	(44)	(48)
Total comprehensive income (loss)	$ (156,402)	$ (167,512)	$ (129,181)	$ (1,244)

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