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Revenue Recognition from Contracts with Customers (Schedule of Operating Revenue) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Regulated Tariff Sales        
Residential $ 20,693 $ 19,788 $ 54,453 $ 53,303
Commercial 4,487 4,418 11,539 11,298
Industrial 2,723 2,868 7,242 7,869
Fire Protection 3,100 3,084 9,211 9,045
Wholesale 3,813 4,319 10,582 11,211
Non-Regulated Contract Operations 2,919 4,203 8,729 11,983
Total Revenue from Contracts with Customers 37,735 38,680 101,756 104,709
Other Regulated Revenues 184 151 315 276
Other Non-Regulated Revenues 101 101 303 303
Inter-segment Elimination (251) (219) (515) (479)
Total Revenue $ 37,769 $ 38,713 $ 101,859 $ 104,809