Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies (Assets and Liabilities Measured on Recurring Basis) (Details)

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Summary of Significant Accounting Policies (Assets and Liabilities Measured on Recurring Basis) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
SARs liability $ 609 $ 2,289
Derivative liability - crude oil swaps 4,806  
SARs liability   193
Liabilities 5,415 2,482
Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
SARs liability 609 2,289
Derivative liability - crude oil swaps 4,806  
SARs liability   193
Liabilities $ 5,415 $ 2,482