CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	4 Months Ended	8 Months Ended	12 Months Ended
	Dec. 31, 2016	Sep. 12, 2016	Dec. 31, 2015	Dec. 31, 2014
Net income (loss)	$ (5,296)	$ 1,054,602	$ (1,582,961)	$ (409,592)
Other comprehensive income (loss):
Change in pension and postretirement obligations, net of tax of $39 for the Successor period from September 13, 2016 through December 31, 2016, $(226) for the Predecessor period from January 1, 2016 through September 12, 2016, and $93 and $(10), for 2015 and 2014, respectively	73	(421)	173	(18)
Total other comprehensive income (loss), net of tax	73	(421)	173	(18)
Comprehensive income (loss)	$ (5,223)	$ 1,054,181	$ (1,582,788)	$ (409,610)