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Long-Term Debt (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Debt Instrument    
Debt $ 3,195,036 $ 3,194,907
Less: current maturities of long-term debt 0 0
Long-term debt 3,195,036 3,194,907
Senior credit facility
   
Debt Instrument    
Debt 0 0
8.75% Senior Notes due 2020, net of $5,101 and $5,264 discount, respectively
   
Debt Instrument    
Debt 444,899 [1] 444,736 [1]
7.5% Senior Notes due 2021, including premium of $3,816 and $3,922, respectively
   
Debt Instrument    
Debt 1,178,816 [2] 1,178,922 [2]
8.125% Senior Notes due 2022
   
Debt Instrument    
Debt 750,000 750,000
7.5% Senior Notes due 2023, net of $3,679 and $3,751 discount, respectively
   
Debt Instrument    
Debt $ 821,321 [3] $ 821,249 [3]
[1] Carrying value is net of $5,101 and $5,264 discount at March 31, 2014 and December 31, 2013, respectively.
[2] Carrying value includes a premium, applicable to notes issued in August 2012, of $3,816 and $3,922 atMarch 31, 2014 and December 31, 2013, respectively.
[3] Carrying value is net of $3,679 and $3,751 discount at March 31, 2014 and December 31, 2013, respectively.