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Long-term Debt - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Instrument [Line Items] |  |
Less: unamortized deferred financing costs on senior unsecured notes | $ (31,200) |
Total long-term debt | 2,735,276 | $ 2,097,606
Senior unsecured notes |  |
Debt Instrument [Line Items] |  |
Total principal of senior unsecured notes | 2,039,409 | 2,052,950
Less: unamortized deferred financing costs on senior unsecured notes | (20,865) | (22,956)
Senior unsecured notes | 7.25% senior unsecured notes due February 1, 2019 |  |
Debt Instrument [Line Items] |  |
Total principal of senior unsecured notes | 0 | 54,275
Senior unsecured notes | 6.50% senior unsecured notes due November 1, 2021 |  |
Debt Instrument [Line Items] |  |
Total principal of senior unsecured notes | 71,835 | 395,501
Senior unsecured notes | 6.875% senior unsecured notes due March 15, 2022 |  |
Debt Instrument [Line Items] |  |
Total principal of senior unsecured notes | 901,480 | 937,080
Senior unsecured notes | 6.875% senior unsecured notes due January 15, 2023 |  |
Debt Instrument [Line Items] |  |
Total principal of senior unsecured notes | 366,094 | 366,094
Senior unsecured notes | 6.25% senior unsecured notes due May 1, 2026 |  |
Debt Instrument [Line Items] |  |
Total principal of senior unsecured notes | 400,000 |
Senior unsecured notes | 2.625% senior unsecured convertible notes due September 15, 2023 |  |
Debt Instrument [Line Items] |  |
Total principal of senior unsecured notes | 300,000 | 300,000
Less: unamortized debt discount on senior unsecured convertible notes | (69,268) | (80,388)
Revolving credit facility | Credit Facility | Oasis Credit Facility |  |
Debt Instrument [Line Items] |  |
Total principal of senior unsecured notes | 468,000 | 70,000
Revolving credit facility | Credit Facility | OMP Credit Facility |  |
Debt Instrument [Line Items] |  |
Total principal of senior unsecured notes | $ 318,000 | $ 78,000

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