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Fair Value Measurements - Estimated Fair Value and Carrying Value of Senior Notes (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Carrying Value $ 4,395,639 $ 3,195,436
8.75% Senior Secured Notes due 2020    
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Carrying Value 1,250,000 0
8.75% Senior Notes due 2020    
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Carrying Value 445,758 445,402
7.5% Senior Notes due 2021    
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Carrying Value 1,149,175 1,178,486
8.125% Senior Notes due 2022    
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Carrying Value 729,000 750,000
7.5% Senior Notes due 2023    
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Carrying Value 821,706 821,548
Fair Value Measurements Level 2 | 8.75% Senior Secured Notes due 2020    
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Fair Value 1,134,375 0
Fair Value Measurements Level 2 | 8.75% Senior Notes due 2020    
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Fair Value 243,000 303,750
Fair Value Measurements Level 2 | 7.5% Senior Notes due 2021    
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Fair Value 514,063 752,000
Fair Value Measurements Level 2 | 8.125% Senior Notes due 2022    
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Fair Value 320,625 472,500
Fair Value Measurements Level 2 | 7.5% Senior Notes due 2023    
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Fair Value $ 348,728 $ 519,750