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Taxes Other than Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Components of Taxes Other than Income Taxes [Abstract]    
Regulatory Assessment $ 285 $ 261
Property 348 345
Payroll, net of amounts capitalized 564 538
Other 3 1
Total taxes other than income taxes $ 1,200 $ 1,145