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Fair Value Measurements - Estimated Fair Value and Carrying Value of Senior Notes (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Carrying Value $ 3,936,994 $ 3,195,436
Senior Secured Notes | 8.75% Senior Secured Notes due 2020    
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Carrying Value 1,250,000 0
Senior Notes | 8.75% Senior Notes due 2020    
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Carrying Value [1] 401,149 445,402
Senior Notes | 7.5% Senior Notes due 2021    
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Carrying Value [2] 996,309 1,178,486
Senior Notes | 8.125% Senior Notes due 2022    
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Carrying Value 601,187 750,000
Senior Notes | 7.5% Senior Notes due 2023    
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Carrying Value [3] 622,923 821,548
Convertible Senior Unsecured Notes | 8.125% Convertible Senior Notes due 2022    
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Carrying Value 36,406 [4] 0
Convertible Senior Unsecured Notes | 7.5% Convertible Senior Notes due 2023    
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Carrying Value 29,020 [5] 0
Fair Value Measurements Level 2 | Senior Secured Notes | 8.75% Senior Secured Notes due 2020    
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Fair Value 757,813 0
Fair Value Measurements Level 2 | Senior Notes | 8.75% Senior Notes due 2020    
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Fair Value 95,128 303,750
Fair Value Measurements Level 2 | Senior Notes | 7.5% Senior Notes due 2021    
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Fair Value 218,605 752,000
Fair Value Measurements Level 2 | Senior Notes | 8.125% Senior Notes due 2022    
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Fair Value 129,255 472,500
Fair Value Measurements Level 2 | Senior Notes | 7.5% Senior Notes due 2023    
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Fair Value 134,846 519,750
Fair Value Measurements Level 2 | Convertible Senior Unsecured Notes | 8.125% Convertible Senior Notes due 2022    
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Fair Value 30,143 0
Fair Value Measurements Level 2 | Convertible Senior Unsecured Notes | 7.5% Convertible Senior Notes due 2023    
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Fair Value $ 23,599 $ 0
[1] Carrying value is net of $3,649 and $4,598 discount at September 30, 2015 and December 31, 2014, respectively.
[2] Carrying value includes a premium of $2,652 and $3,486 at September 30, 2015 and December 31, 2014, respectively.
[3] Carrying value is net of $2,436 and $3,452 discount at September 30, 2015 and December 31, 2014, respectively.
[4] Carrying value includes holder conversion feature liabilities with fair value of $3,113 and is net of $105,691 discount at September 30, 2015.
[5] Carrying value includes holder conversion feature liabilities with fair value of $2,361 and is net of $87,412 discount at September 30, 2015.