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Revenue Recognition from Contracts with Customers (Schedule of Operating Revenue) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Regulated Tariff Sales        
Residential $ 19,454 $ 17,780 $ 36,135 $ 33,760
Commercial 3,649 3,744 7,018 7,053
Industrial 2,175 2,321 4,256 4,519
Fire Protection 3,060 3,098 6,106 6,111
Wholesale 3,827 3,429 7,525 6,768
Non-Regulated Contract Operations 3,076 2,986 5,934 5,810
Total Revenue from Contracts with Customers 35,241 33,358 66,974 64,021
Other Regulated Revenues 124 73 186 131
Other Non-Regulated Revenues 104 100 207 202
Inter-segment Elimination (192) (138) (321) (264)
Total Revenue $ 35,277 $ 33,393 $ 67,046 $ 64,090