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Derivatives and Fair Value (Effect of Derivative Instruments on the Condensed Consolidated Statements of Operations) (Details) - Crude Oil Swaps [Member] - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative instruments gain (loss), net $ (31,758) $ (5,954)
Cash Settlements Paid On Matured Derivative Contracts, Net [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative instruments gain (loss), net (12,500) (1,710)
Cash Settlements Not Paid On Matured Derivative Contracts, Net [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative instruments gain (loss), net $ (19,258) $ (4,244)