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Fair Value Measurements - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Oct. 31, 2015
Aug. 31, 2015
Jun. 30, 2015
8.75% Senior Secured Notes | Senior Secured Notes            
Fair Value, Assets and Liabilities Measured on Recurring Basis            
Debt, face amount $ 1,300,000,000 $ 1,300,000,000   $ 78,000,000   $ 1,250,000,000.0
Long-term debt, fixed interest rate 8.75% 8.75%        
8.75% Senior Secured Notes | Senior Notes            
Fair Value, Assets and Liabilities Measured on Recurring Basis            
Long-term debt, fixed interest rate 8.75% 8.75% 8.75%      
8.75% Senior Notes due 2020 | Senior Notes            
Fair Value, Assets and Liabilities Measured on Recurring Basis            
Long-term debt, fixed interest rate 8.75% 8.75% 8.75%      
Aggregate outstanding principal amount $ 100,000,000 $ 100,000,000        
Write off of derivative holder conversion feature to reorganization items $ 2,500,000 $ 2,500,000        
8.125% Convertible Senior Notes due 2022            
Fair Value, Assets and Liabilities Measured on Recurring Basis            
Long-term debt, fixed interest rate 8.125% 8.125%        
8.125% Convertible Senior Notes due 2022 | Senior Notes            
Fair Value, Assets and Liabilities Measured on Recurring Basis            
Long-term debt, fixed interest rate 8.125% 8.125% 8.125%      
8.125% Convertible Senior Notes due 2022 | Convertible Senior Unsecured Notes            
Fair Value, Assets and Liabilities Measured on Recurring Basis            
Long-term debt, fixed interest rate         8.125%  
7.5% Convertible Senior Notes due 2023            
Fair Value, Assets and Liabilities Measured on Recurring Basis            
Long-term debt, fixed interest rate 7.50% 7.50%        
7.5% Convertible Senior Notes due 2023 | Senior Notes            
Fair Value, Assets and Liabilities Measured on Recurring Basis            
Long-term debt, fixed interest rate 7.50% 7.50% 7.50%      
7.5% Convertible Senior Notes due 2023 | Convertible Senior Unsecured Notes            
Fair Value, Assets and Liabilities Measured on Recurring Basis            
Long-term debt, fixed interest rate         7.50%  
Write off of derivative holder conversion feature to reorganization items $ 7,300,000 $ 7,300,000        
Debt holder conversion feature            
Fair Value, Assets and Liabilities Measured on Recurring Basis            
Write off of derivative holder conversion feature to reorganization items $ 7,281,000 $ 7,281,000