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Organization, Summary of Significant Accounting Policies and Recent Developments (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Organization, Summary Of Significant Accounting Policies And Recent Developments [Line Items]      
Percent voting interest 50.00%    
Percent of operating revenues 88.00%    
Percent of total assets 99.00%    
Allowance for doubtful accounts $ 1,000 $ 900  
Bad debt expense 800 500 $ 700
Write-offs 700 500 600
Investment 200    
Loan to RGRME 1,700    
Uncollectible notes receivable 1,700    
Noncash impairment charge 200    
Cash, Cash Equivalents and Restricted Cash, Beginning 1,500 400 400
Cash, Cash Equivalents and Restricted Cash, Ending   1,500 400
Operations and Maintenance expense and Other Income (Expense), net   $ 800 $ 300
Effect of lease liability and right-of-use asset $ 7,300    
Minimum [Member]      
Organization, Summary Of Significant Accounting Policies And Recent Developments [Line Items]      
Estimated useful lives of non-regulated fixed assets 3 years    
Maximum [Member]      
Organization, Summary Of Significant Accounting Policies And Recent Developments [Line Items]      
Estimated useful lives of non-regulated fixed assets 40 years