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, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset commodity swap $ 3,520  
Assets 3,520  
SARs liability 1,632 $ 146
Liabilities 1,632 146
Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset commodity swap  
Assets  
SARs liability
Liabilities
Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset commodity swap 3,520  
Assets 3,520  
SARs liability 1,632 146
Liabilities 1,632 146
Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset commodity swap  
Assets  
SARs liability
Liabilities