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Chapter 11 Proceedings - Reorganization Items (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Reorganizations [Abstract]        
Unamortized debt premiums and discounts     $ (95,296)  
Unamortized debt issuance costs     (63,287)  
Debt holder conversion feature and mandatory prepayment feature - PGC Senior Secured Notes $ 9,777   9,777  
Estimated litigation claims (20,500)   (20,478)  
Rejection of executory contracts (18,200)   (18,161)  
Ad valorem and franchise taxes     (3,494)  
Legal and professional fees and expenses     (10,759)  
Adjustment of pre-petition accounts payable settlements     780  
Reorganization items $ (200,918) $ 0 $ (200,918) $ 0