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Fair Value Measurements - Estimated Fair Value and Carrying Value of Senior Notes (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Fair Value Assets And Liabilities Measured On Recurring Basis    
Carrying value $ 3,194,907 $ 4,301,083
9.875% Senior Notes due 2016
    
Fair Value Assets And Liabilities Measured On Recurring Basis    
Carrying value 0 [1] 356,657 [1]
8.0% Senior Notes due 2018
    
Fair Value Assets And Liabilities Measured On Recurring Basis    
Carrying value 0 750,000
8.75% Senior Notes due 2020
    
Fair Value Assets And Liabilities Measured On Recurring Basis    
Carrying value 444,736 [2] 444,127 [2]
7.5% Senior Notes due 2021
    
Fair Value Assets And Liabilities Measured On Recurring Basis    
Carrying value 1,178,922 [3] 1,179,328 [3]
8.125% Senior Notes due 2022
    
Fair Value Assets And Liabilities Measured On Recurring Basis    
Carrying value 750,000 750,000
7.5% Senior Notes due 2023
    
Fair Value Assets And Liabilities Measured On Recurring Basis    
Carrying value 821,249 [4] 820,971 [4]
Fair Value Measurements Level 2 | 9.875% Senior Notes due 2016
    
Fair Value Assets And Liabilities Measured On Recurring Basis    
Fair value 0 [1] 392,913 [1]
Fair Value Measurements Level 2 | 8.0% Senior Notes due 2018
    
Fair Value Assets And Liabilities Measured On Recurring Basis    
Fair value 0 790,313
Fair Value Measurements Level 2 | 8.75% Senior Notes due 2020
    
Fair Value Assets And Liabilities Measured On Recurring Basis    
Fair value 486,000 [2] 490,500 [2]
Fair Value Measurements Level 2 | 7.5% Senior Notes due 2021
    
Fair Value Assets And Liabilities Measured On Recurring Basis    
Fair value 1,230,813 [3] 1,257,250 [3]
Fair Value Measurements Level 2 | 8.125% Senior Notes due 2022
    
Fair Value Assets And Liabilities Measured On Recurring Basis    
Fair value 795,000 823,125
Fair Value Measurements Level 2 | 7.5% Senior Notes due 2023
    
Fair Value Assets And Liabilities Measured On Recurring Basis    
Fair value $ 837,375 [4] $ 882,750 [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.