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Fair Value Measurements - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Oct. 31, 2015
8.75% Senior Secured Notes | Senior Secured Notes            
Fair Value, Assets and Liabilities Measured on Recurring Basis            
Face amount of debt instrument   $ 1,250,000,000.0   $ 1,250,000,000.0   $ 78,000,000.0
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 Debt            
Fair Value, Assets and Liabilities Measured on Recurring Basis            
Long-term debt, fixed interest rate 8.125% 8.125% 8.125% 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 Debt            
Fair Value, Assets and Liabilities Measured on Recurring Basis            
Long-term debt, fixed interest rate 7.50% 7.50% 7.50% 7.50%    
Write off of derivative holder conversion feature to reorganization items     $ 7,281,000      
Debt holder conversion feature            
Fair Value, Assets and Liabilities Measured on Recurring Basis            
Write off of derivative holder conversion feature to reorganization items   $ 0 $ 7,281,000 $ 0