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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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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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