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, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset commodity $ 477 $ 3,520
Assets 477 3,520
SARs liability 2,532 1,007
SARs liability 624 625
Liabilities 3,156 1,632
Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset commodity 477 3,520
Assets 477 3,520
SARs liability 2,532 1,007
SARs liability 624 625
Liabilities $ 3,156 $ 1,632