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Fair Value Measurements - Estimated Fair Value and Carrying Value of Senior Notes (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Carrying Value | $ 3,631,506 | $ 3,195,436
Secured Debt | 8.75% Senior Secured Notes Due 2020 |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Carrying Value | 1,301,098 | 0
Secured Debt | Fair Value Measurements Level 2 | 8.75% Senior Secured Notes Due 2020 |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Fair Value | 403,098 | 0
Senior Notes | 8.75% Senior Notes due 2020 |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Carrying Value | 392,666 | 445,402
Senior Notes | 7.5% Senior Notes due 2021 |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Carrying Value | 759,711 | 1,178,486
Senior Notes | 8.125% Senior Notes due 2022 |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Carrying Value | 527,737 | 750,000
Senior Notes | 7.5% Senior Notes due 2023 |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Carrying Value | 541,572 | 821,548
Senior Notes | Fair Value Measurements Level 2 | 8.75% Senior Notes due 2020 |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Fair Value | 39,740 | 303,750
Senior Notes | Fair Value Measurements Level 2 | 7.5% Senior Notes due 2021 |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Fair Value | 79,812 | 752,000
Senior Notes | Fair Value Measurements Level 2 | 8.125% Senior Notes due 2022 |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Fair Value | 57,749 | 472,500
Senior Notes | Fair Value Measurements Level 2 | 7.5% Senior Notes due 2023 |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Fair Value | 58,799 | 519,750
Convertible Debt | 8.125% Convertible Senior Notes due 2022 |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Carrying Value | 82,294 | 0
Convertible Debt | 7.5% Convertible Senior Notes due 2023 |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Carrying Value | 26,428 | 0
Convertible Debt | Fair Value Measurements Level 2 | 8.125% Convertible Senior Notes due 2022 |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Fair Value | 44,199 | 0
Convertible Debt | Fair Value Measurements Level 2 | 7.5% Convertible Senior Notes due 2023 |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Fair Value | $ 15,125 | $ 0

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