CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (243,413)	$ 54,362	$ (175,034)	$ 67,290
Other comprehensive loss:
Change in pension and postretirement obligations, net of tax of $0 and $0 in 2016	(2)	0	(4)	(2)
Total Other Comprehensive Income (Loss), Net of Tax	(2)	0	(4)	(2)
Comprehensive income (loss)	$ (243,415)	$ 54,362	$ (175,038)	$ 67,288