Chapter 11 Proceedings - Reorganization Items (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Reorganizations [Abstract]
Unamortized debt premiums and discounts	$ 0		$ (95,296)
Unamortized debt issuance costs	(5)		(63,292)
Debt holder conversion feature and mandatory prepayment feature - PGC Senior Secured Notes	0		9,777
Estimated litigation claims	0		(20,478)
Rejections and cures of executory contracts	(3,148)		(21,309)
Ad valorem and franchise taxes	0		(3,494)
Legal and professional fees and expenses	(45,176)		(55,935)
Adjustment of pre-petition accounts payable settlements	5,575		6,355
Reorganization items	$ (42,754)	$ 0	$ (243,672)	$ 0