Quarterly report pursuant to Section 13 or 15(d)

Organization and Accounting Policies (Assets and Liabilities Measured on Recurring Basis) (Details)

v3.21.2
Organization and Accounting Policies (Assets and Liabilities Measured on Recurring Basis) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
SARs liability $ 761 $ 2,289
Derivative liability - crude oil swaps 10,881  
SARs liability   193
Liabilities 11,642 2,482
Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
SARs liability 761 2,289
Derivative liability - crude oil swaps 10,881  
SARs liability   193
Liabilities $ 11,642 $ 2,482