Chapter 11 Proceedings - Costs of Reorganization (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Reorganization Items [Abstract]
Professional fees	$ (3,285)	$ (3,215)	$ (65,289)	$ (6,797)
Gains (losses)			431,107
Deferred financing costs				(18,742)
Make-whole fees	(223,838)		(223,838)
Other		106	167	247
Total Reorganization items, net	$ (227,123)	$ (3,109)	$ 142,147	$ (25,292)