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Debt - Chapter 11 Proceedings (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2016
Sep. 30, 2015
Oct. 04, 2016
Dec. 31, 2015
Debt Instrument          
Proceeds from borrowings   $ 489,198,000 $ 2,190,000,000    
Debt issued $ 0 0     $ 3,562,378,000
Unamortized debt issuance costs and associated discounts and premiums written-off   158,600,000      
Debt holder conversion feature and mandatory prepayment feature - PGC Senior Secured Notes 0 9,777,000      
Unamortized discount (premium) and debt issuance costs, net         342,600,000
Fair value of debt derivative         $ 32,300,000
Convertible Senior Unsecured Notes          
Debt Instrument          
Debt reclassified to liabilities subject to compromise 87,600,000 87,600,000      
Secured Notes          
Debt Instrument          
Debt reclassified to liabilities subject to compromise 1,300,000,000 1,300,000,000      
Senior Unsecured Notes          
Debt Instrument          
Debt reclassified to liabilities subject to compromise 2,200,000,000 2,200,000,000      
Senior credit facility          
Debt Instrument          
Debt reclassified to liabilities subject to compromise $ 449,200,000 $ 449,200,000      
Subsequent Event | Revolving Credit Facility | New Credit Facility          
Debt Instrument          
Maximum borrowing capacity       $ 425,000,000.0  
Subsequent Event | Convertible Senior Unsecured Notes | New Convertible Debt          
Debt Instrument          
Face amount of debt instrument       281,800,000  
Subsequent Event | Secured Notes | New Building Note          
Debt Instrument          
Face amount of debt instrument       $ 35,000,000.0