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Debt - Schedule of Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Oct. 31, 2015
Aug. 31, 2015
Debt Instrument        
Unamortized discounts, premiums, and deferred costs, net $ 157,900 $ 342,600    
Fair value of debt derivative 9,800 32,300    
Debt 3,981,371 3,562,378    
Less: current maturities of long-term debt(1) 3,981,371 0    
Long-term debt $ 0 3,562,378    
8.125% Convertible Senior Notes due 2022        
Debt Instrument        
Long-term debt, fixed interest rate 8.125%      
7.5% Convertible Senior Notes due 2023        
Debt Instrument        
Long-term debt, fixed interest rate 7.50%      
Senior credit facility        
Debt Instrument        
Debt $ 488,900 0    
Senior Secured Notes | 8.75% Senior Secured Notes due 2020        
Debt Instrument        
Fair value of debt derivative     $ 2,800  
Debt $ 1,267,924 $ 1,265,814    
Long-term debt, fixed interest rate 8.75% 8.75%    
Senior Notes | 8.75% Senior Notes due 2020        
Debt Instrument        
Debt $ 389,645 $ 389,232    
Long-term debt, fixed interest rate 8.75% 8.75%    
Senior Notes | 7.5% Senior Notes due 2021        
Debt Instrument        
Debt $ 751,416 $ 751,087    
Long-term debt, fixed interest rate 7.50% 7.50%    
Senior Notes | 8.125% Senior Notes due 2022        
Debt Instrument        
Debt $ 519,026 $ 518,693    
Long-term debt, fixed interest rate 8.125% 8.125%    
Senior Notes | 7.5% Senior Notes due 2023        
Debt Instrument        
Debt $ 535,191 $ 534,869    
Long-term debt, fixed interest rate 7.50% 7.50%    
Senior Notes | 8.125% Convertible Senior Notes due 2022        
Debt Instrument        
Long-term debt, fixed interest rate 8.125% 8.125%    
Senior Notes | 7.5% Convertible Senior Notes due 2023        
Debt Instrument        
Long-term debt, fixed interest rate 7.50% 7.50%    
Convertible Senior Unsecured Notes | 8.125% Convertible Senior Notes due 2022        
Debt Instrument        
Debt $ 14,692 $ 78,290    
Long-term debt, fixed interest rate 8.125% 8.125%   8.125%
Convertible Senior Unsecured Notes | 7.5% Convertible Senior Notes due 2023        
Debt Instrument        
Debt $ 14,577 $ 24,393    
Long-term debt, fixed interest rate 7.50% 7.50%   7.50%