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Long-Term Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Debt Instrument    
Senior credit facility $ 0 $ 0
Debt 4,395,639 3,195,436
Less: current maturities of long-term debt 0 0
Long-term debt 4,395,639 3,195,436
8.75% Senior Secured Notes due 2020    
Debt Instrument    
Debt 1,250,000 0
8.75% Senior Notes due 2020, net of $4,242 and $4,598 discount, respectively    
Debt Instrument    
Debt 445,758 445,402
7.5% Senior Notes due 2021, including premium of $3,175 and $3,486, respectively    
Debt Instrument    
Debt 1,149,175 1,178,486
8.125% Senior Notes due 2022    
Debt Instrument    
Debt 729,000 750,000
7.5% Senior Notes due 2023, net of $3,294 and $3,452 discount, respectively    
Debt Instrument    
Debt 821,706 821,548
Senior Secured Notes | 8.75% Senior Secured Notes due 2020    
Debt Instrument    
Debt 1,250,000 0
Senior Notes | 8.75% Senior Notes due 2020, net of $4,242 and $4,598 discount, respectively    
Debt Instrument    
Debt 445,758 445,402
Senior Notes | 7.5% Senior Notes due 2021, including premium of $3,175 and $3,486, respectively    
Debt Instrument    
Debt 1,149,175 1,178,486
Senior Notes | 8.125% Senior Notes due 2022    
Debt Instrument    
Debt 729,000 750,000
Senior Notes | 7.5% Senior Notes due 2023, net of $3,294 and $3,452 discount, respectively    
Debt Instrument    
Debt $ 821,706 $ 821,548