Other Liabilities (Details) - Non Current Liabilities - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Schedule of Other Liabilities [Line Items]
Production Tax Liability	$ 94,371	$ 65,592
Deferred oil gathering credits	17,588	18,090
Deferred Midstream gathering credits	166,826	168,478
Operating and Finance Lease Liability, Noncurrent	9,883	10,763
Other Accrued Liabilities	1,718	1,111
Other Accrued Liabilities, Noncurrent	$ 290,386	$ 264,034