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Income Taxes (Schedule of Net Deferred Tax Liability) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]    
Utility Plant Related $ 56,868 $ 50,608
Customer Advances (3,626) (3,661)
Employee Benefits 7,339 6,543
Investment Tax Credits (ITC) 445 519
Other 271 399
Total Deferred Tax Liability and ITC $ 61,297 $ 54,408