CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (UNAUDITED) (in thousands) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (89,252)	$ 50,388	$ (501,147)	$ (127,180)
Other comprehensive income, net of tax:
Pension liability adjustment	188	119	378	382
Total other comprehensive income, net of tax	188	119	378	382
Total comprehensive income (loss)	$ (89,064)	$ 50,507	$ (500,769)	$ (126,798)