CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Net income (loss)			$ 49,410
Successor [Member]
Net income (loss)	$ 21,329		49,410
Other comprehensive loss:
Change in pension and postretirement obligations, net of tax $0 and $0 in 2016	0		0
Total Other Comprehensive Income (Loss), Net of Tax	0		0
Comprehensive income (loss)	$ 21,329		$ 49,410
Predecessor [Member]
Net income (loss)		$ (67,266)		$ (100,739)
Other comprehensive loss:
Change in pension and postretirement obligations, net of tax $0 and $0 in 2016		(11)		(38)
Total Other Comprehensive Income (Loss), Net of Tax		(11)		(38)
Comprehensive income (loss)		$ (67,277)		$ (100,777)