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Long-Term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Senior credit facility $ 0 $ 0
Total debt 3,631,506 3,195,436
Less: current maturities of long-term debt 0 0
Long-term debt 3,631,506 3,195,436
Secured Debt | 8.75% Senior Secured Notes due 2020, including mandatory prepayment feature liabilities of $2,941, and net of $29,842 discount    
Debt Instrument [Line Items]    
Total debt 1,301,098 0
Senior Notes | 8.75% Senior Notes due 2020, net of $3,269 and $4,598 discount, respectively    
Debt Instrument [Line Items]    
Total debt 392,666 445,402
Senior Notes | 7.5% Senior Notes due 2021, including a premium of $1,944 and $3,486, respectively    
Debt Instrument [Line Items]    
Total debt 759,711 1,178,486
Senior Notes | 8.125% Senior Notes due 2022    
Debt Instrument [Line Items]    
Total debt 527,737 750,000
Senior Notes | 7.5% Senior Notes due 2023, net of $1,989 and $3,452 discount, respectively    
Debt Instrument [Line Items]    
Total debt 541,572 821,548
Convertible Debt | 8.125% Convertible Senior Notes due 2022, including holder conversion feature liabilities of $21,874, and net of $180,751 discount    
Debt Instrument [Line Items]    
Total debt 82,294 0
Convertible Debt | 7.5% Convertible Senior Notes due 2023, including holder conversion feature liabilities of $7,481, and net of $59,549 discount    
Debt Instrument [Line Items]    
Total debt $ 26,428 $ 0