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Commitments and Contingencies (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Feb. 26, 2021
Jan. 31, 2019
Mar. 31, 2021
Dec. 31, 2020
Aug. 21, 2020
Long-term Purchase Commitment [Line Items]          
Legal settlement     $ 0 $ 2,070  
Litigation Settlement, Amount Awarded to Other Party $ 2,100 $ 2,400      
Cockerell Oil Properties, Ltd., v. Unit Petroleum Company [Member]          
Long-term Purchase Commitment [Line Items]          
Legal settlement         $ 15,750
Chieftan Royalty Company v. Unit Petroleum Company [Member]          
Long-term Purchase Commitment [Line Items]          
Legal settlement         $ 29,250
Mid-Stream [Member]          
Long-term Purchase Commitment [Line Items]          
Other Commitment, Due in Next Twelve Months     800    
Other Commitment, Due in Second and Third Year     $ 300    
Capital Addition Purchase Commitments [Member] | Oil and Natural Gas [Member]          
Long-term Purchase Commitment [Line Items]          
Long-term Purchase Commitment, Description     as part of the Superior transaction (see Note 15 – Variable Interest Entity Arrangements), we entered into a contractual obligation committing us to spend $150.0 million to drill wells in the Granite Wash/Buffalo Wallow area over three years starting January 1, 2019. For each dollar of the $150.0 million we do not spend (over the three-year period), we would forgo receiving $0.58 of future distributions from our ownership interest in our consolidated mid-stream subsidiary. At March 31, 2021, if we elected not to drill or spend any additional money in the designated area before December 31, 2021, the maximum amount we could forgo from distributions would be $72.6 million.    
Long-term purchase commitment, purchases made     $ 24,800