CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (20,021)	$ 163,094
Other comprehensive loss:
Change in pension and postretirement obligations, net of tax	2	(1)
Total other comprehensive income (loss), net	2	(1)
Comprehensive income (loss)	(20,019)	163,093
Net loss attributable to Noncontrolling interest	6,449	0
Other comprehensive income attributable to Noncontrolling interest	(1)	0
Comprehensive income (loss) attributable to common shareholders	$ (13,571)	$ 163,093