CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Net income (loss)	$ 28,407
Successor [Member]
Net income (loss)	28,407
Comprehensive income (loss)	28,407
Other comprehensive loss:
Change in pension and postretirement obligations, net of tax $0 in 2016	0
Total Other Comprehensive Income (Loss), Net of Tax	$ 0
Predecessor [Member]
Net income (loss)		$ (33,473)
Comprehensive income (loss)		(33,500)
Other comprehensive loss:
Change in pension and postretirement obligations, net of tax $0 in 2016		(27)
Total Other Comprehensive Income (Loss), Net of Tax		$ (27)