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Long-Term Debt - Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Sep. 15, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Total long-term debt | $ 2,125,573 |  | $ 2,302,584
Line of Credit [Member] | Revolving Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total long-term debt | 195,000 |  | 138,000
Senior Unsecured Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total long-term debt | 2,052,950 |  | 2,200,000
Less: unamortized deferred financing costs on senior unsecured notes | (29,500) |  | (35,416)
Senior Unsecured Debt [Member] | 7.25% senior unsecured notes due February 1, 2019 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total long-term debt | $ 54,275 |  | 400,000
Stated interest rate (as percent) | 7.25% |  |
Senior Unsecured Debt [Member] | 6.5% senior unsecured notes due November 1, 2021 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total long-term debt | $ 395,501 |  | 400,000
Stated interest rate (as percent) | 6.50% |  |
Senior Unsecured Debt [Member] | 6.875% senior unsecured notes due March 15, 2022 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total long-term debt | $ 937,080 |  | 1,000,000
Stated interest rate (as percent) | 6.875% |  |
Senior Unsecured Debt [Member] | 6.875% senior unsecured notes due January 15, 2023 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total long-term debt | $ 366,094 |  | 400,000
Stated interest rate (as percent) | 6.875% |  |
Senior Unsecured Debt [Member] | 2.625% senior convertible notes due September 15, 2023 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total long-term debt | $ 300,000 |  | 0
Less: unamortized debt discount on senior unsecured convertible notes | $ (92,877) | $ (93,200) | $ 0
Stated interest rate (as percent) | 2.625% |  |

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