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Income Taxes (Schedule of Net Deferred Tax Liability) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]    
Utility Plant Related $ 50,608 $ 44,777
Customer Advances (3,661) (3,702)
Employee Benefits 6,543 5,490
Investment Tax Credits (ITC) 519 596
Other 399 109
Total Deferred Tax Liability and ITC $ 54,408 $ 47,270