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Long-Term Debt (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Debt $ 3,194,907 $ 4,301,083
Less: current maturities of long-term debt 0 0
Long-term debt 3,194,907 4,301,083
Senior credit facility
    
Debt Instrument [Line Items]    
Debt 0 0
9.875% Senior Notes due 2016, net of $8,843 discount at December 31, 2012
    
Debt Instrument [Line Items]    
Debt 0 [1] 356,657 [1]
8.0% Senior Notes due 2018
    
Debt Instrument [Line Items]    
Debt 0 750,000
8.75% Senior Notes due 2020, net of $5,264 and $5,873 discount, respectively
    
Debt Instrument [Line Items]    
Debt 444,736 [2] 444,127 [2]
7.5% Senior Notes due 2021, including a premium of $3,922 and $4,328, respectively
    
Debt Instrument [Line Items]    
Debt 1,178,922 [3] 1,179,328 [3]
8.125% Senior Notes due 2022
    
Debt Instrument [Line Items]    
Debt 750,000 750,000
7.5% Senior Notes due 2023, net of $3,751 and $4,029 discount, respectively
    
Debt Instrument [Line Items]    
Debt $ 821,249 [4] $ 820,971 [4]
[1] Carrying value is net of $8,843 discount at December 31, 2012.
[2] Carrying value is net of $5,264 and $5,873 discount at December 31, 2013 and 2012, respectively.
[3] Carrying value includes a premium, applicable to notes issued in August 2012, of $3,922 and $4,328 at December 31, 2013 and 2012, respectively.
[4] Carrying value is net of $3,751 and $4,029 discount at December 31, 2013 and 2012, respectively.