CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	1 Months Ended	2 Months Ended	3 Months Ended	8 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 12, 2016	Sep. 30, 2017	Sep. 12, 2016	Sep. 30, 2017
Net income (loss)					$ 43,463
Successor [Member]
Net income (loss)	$ (3,441)		$ (5,947)		43,463
Other comprehensive loss:
Change in pension and postretirement obligations, net of tax of $0 and $0 in 2016	0		0		0
Total Other Comprehensive Income (Loss), Net of Tax	0		0		0
Comprehensive income (loss)	$ (3,441)		$ (5,947)		$ 43,463
Predecessor [Member]
Net income (loss)		$ 1,155,341		$ 1,054,602
Other comprehensive loss:
Change in pension and postretirement obligations, net of tax of $0 and $0 in 2016		(383)		(421)
Total Other Comprehensive Income (Loss), Net of Tax		(383)		(421)
Comprehensive income (loss)		$ 1,154,958		$ 1,054,181