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Long-Term Debt - Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Total long-term debt	$ 2,791,333	$ 2,735,276
Credit Facility | Revolving Credit Facility | Oasis Credit Facility
Debt Instrument [Line Items]
Total principal of senior unsecured notes and revolving line of credit	493,000	468,000
Credit Facility | Revolving Credit Facility | OMP Credit Facility
Debt Instrument [Line Items]
Total principal of senior unsecured notes and revolving line of credit	345,000	318,000
Senior Notes
Debt Instrument [Line Items]
Total principal of senior unsecured notes and revolving line of credit	2,039,409	2,039,409
Less: unamortized deferred financing costs on senior unsecured notes	$ (19,692)	(20,865)
Senior Notes | 6.50% senior unsecured notes due November 1, 2021
Debt Instrument [Line Items]
Stated interest rate (as percent)	6.50%
Total principal of senior unsecured notes and revolving line of credit	$ 71,835	71,835
Senior Notes | 6.875% senior unsecured notes due March 15, 2022
Debt Instrument [Line Items]
Stated interest rate (as percent)	6.875%
Total principal of senior unsecured notes and revolving line of credit	$ 901,480	901,480
Senior Notes | 6.875% senior unsecured notes due January 15, 2023
Debt Instrument [Line Items]
Stated interest rate (as percent)	6.875%
Total principal of senior unsecured notes and revolving line of credit	$ 366,094	366,094
Senior Notes | 6.25% senior unsecured notes due May 1, 2026
Debt Instrument [Line Items]
Stated interest rate (as percent)	6.25%
Total principal of senior unsecured notes and revolving line of credit	$ 400,000	400,000
Senior Notes | 2.625% senior unsecured convertible notes due September 15, 2023
Debt Instrument [Line Items]
Stated interest rate (as percent)	2.625%
Total principal of senior unsecured notes and revolving line of credit	$ 300,000	300,000
Less: unamortized debt discount on senior unsecured convertible notes	(66,384)	$ (69,268)
Total long-term debt	$ 300,000

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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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Contractual interest rate for funds borrowed, under the debt agreement.

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