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Long-Term Debt - Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Less: current maturities of long-term debt	$ (360,640)	$ 0
Less amounts reclassed to liabilities subject to compromise	(1,825,757)	0
Total long-term debt	487,500	2,711,573
Senior Notes
Debt Instrument [Line Items]
Total principal of senior unsecured notes and revolving line of credit	1,825,757	1,982,568
Less: unamortized deferred financing costs on senior unsecured notes	$ 0	(15,618)
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	$ 43,601	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	$ 834,466	890,980
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	$ 307,728	351,953
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	$ 395,122	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	$ 244,840	267,800
Less: unamortized debt discount on senior unsecured convertible notes	0	(50,877)
Revolving Credit Facility | Credit Facility | Oasis Credit Facility
Debt Instrument [Line Items]
Total principal of senior unsecured notes and revolving line of credit	360,640	337,000
Revolving Credit Facility | Credit Facility | OMP Credit Facility
Debt Instrument [Line Items]
Total principal of senior unsecured notes and revolving line of credit	$ 487,500	$ 458,500

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Long-term Debt, Reclassified to Liabilities Subject to Compromise

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