Quarterly report pursuant to Section 13 or 15(d)

Organization And Accounting Policies (Summary Of Liabilities Measured On Recurring Basis) (Details)

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Organization And Accounting Policies (Summary Of Liabilities Measured On Recurring Basis) (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Derivatives, Fair Value [Line Items]    
Liabilities $ 5,175 $ 146
Fair Value, Inputs, Level 2 [Member]    
Derivatives, Fair Value [Line Items]    
Liabilities 2,064  
Fair Value, Inputs, Level 3 [Member]    
Derivatives, Fair Value [Line Items]    
Liabilities 3,111 146
SARs Liability [Member]    
Derivatives, Fair Value [Line Items]    
Liabilities 3,111 146
SARs Liability [Member] | Fair Value, Inputs, Level 3 [Member]    
Derivatives, Fair Value [Line Items]    
Liabilities 3,111 $ 146
Derivative Liability Swaps [Member]    
Derivatives, Fair Value [Line Items]    
Liabilities 2,064  
Derivative Liability Swaps [Member] | Fair Value, Inputs, Level 2 [Member]    
Derivatives, Fair Value [Line Items]    
Liabilities $ 2,064