Quarterly report pursuant to Section 13 or 15(d)

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

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Organization and Accounting Policies (Assets and Liabilities Measured on Recurring Basis) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset commodity $ 7,257 $ 636
Assets 7,257 636
SARs liability 742 2,638
SARs liability 34 852
Liabilities 776 3,490
Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset commodity 7,257 636
Assets 7,257 636
SARs liability 742 2,638
SARs liability 34 852
Liabilities $ 776 $ 3,490