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Taxes Other than Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Components of Taxes Other than Income Taxes [Abstract]    
Regulatory assessment $ 298 $ 285
Property 353 348
Payroll, net of amounts capitalized 551 564
Other 3 3
Total taxes other than income taxes $ 1,205 $ 1,200