CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 54,362	$ 16,276	$ 67,290	$ 24,050
Other comprehensive loss:
Change in pension and postretirement obligations, net of tax of $0 and $0 in 2016	0	0	(2)	0
Total Other Comprehensive Income (Loss), Net of Tax	0	0	(2)	0
Comprehensive income (loss)	$ 54,362	$ 16,276	$ 67,288	$ 24,050