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Fair Value Measurements - Estimated Fair Value and Carrying Value of Senior Notes (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Carrying Value $ 3,195,165 $ 3,194,907
8.75% Senior Notes due 2020
    
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Carrying Value 445,062 [1] 444,736 [1]
7.5% Senior Notes due 2021
    
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Carrying Value 1,178,708 [2] 1,178,922 [2]
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 821,395 [3] 821,249 [3]
Fair Value Measurements Level 2 | 8.75% Senior Notes due 2020
    
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Fair Value 483,750 [1] 486,000 [1]
Fair Value Measurements Level 2 | 7.5% Senior Notes due 2021
    
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Fair Value 1,273,465 [2] 1,230,813 [2]
Fair Value Measurements Level 2 | 8.125% Senior Notes due 2022
    
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Fair Value 825,000 795,000
Fair Value Measurements Level 2 | 7.5% Senior Notes due 2023
    
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Fair Value $ 893,063 [3] $ 837,375 [3]
[1] Carrying value is net of $4,938 and $5,264 discount at June 30, 2014 and December 31, 2013, respectively.
[2] Carrying value includes a premium, applicable to notes issued in August 2012, of $3,708 and $3,922 atJune 30, 2014 and December 31, 2013, respectively.
[3] Carrying value is net of $3,605 and $3,751 discount at June 30, 2014 and December 31, 2013, respectively.