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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
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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.

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