Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.2
Organization and Accounting Policies (Assets and Liabilities Measured on Recurring Basis) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset commodity   $ 636
Assets   636
SARs liability $ 1,380 2,638
SARs liability 56 852
Liabilities 1,436 3,490
Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset commodity   636
Assets   636
SARs liability 1,380 2,638
SARs liability 56 852
Liabilities $ 1,436 $ 3,490