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Commitments and Contingencies (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Feb. 26, 2021
Jan. 31, 2019
Sep. 30, 2018
Sep. 30, 2021
Dec. 31, 2020
Aug. 21, 2020
Long-term Purchase Commitment [Line Items]            
Maximum foregone distributions over the remainder of the long-term purchase commitment       $ 72,600,000    
Legal settlement       0 $ 2,070,000  
Litigation Settlement, Amount Awarded to Other Party $ 2,100,000 $ 2,400,000        
Cockerell Oil Properties, Ltd., v. Unit Petroleum Company [Member]            
Long-term Purchase Commitment [Line Items]            
Legal settlement           $ 15,750,000
Chieftan Royalty Company v. Unit Petroleum Company [Member]            
Long-term Purchase Commitment [Line Items]            
Legal settlement           $ 29,250,000
Mid-Stream [Member]            
Long-term Purchase Commitment [Line Items]            
Other Commitment, Due in Next Twelve Months       1,100,000    
Other Commitment, Due in Second and Third Year       100,000    
Capital Addition Purchase Commitments [Member] | Oil and Natural Gas [Member]            
Long-term Purchase Commitment [Line Items]            
Long-term purchase commitment     $ 150,000,000      
Long-term purchase commitment, period     3 years      
Long-term purchase commitment, purchases made       $ 24,800,000