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Jointly Owned Electric Facilities (Tables)
12 Months Ended
Dec. 31, 2017
Jointly Owned Utility Plant, Net Ownership Amount [Abstract]  
Schedule Of Jointly Owned Electric Facilities
 
2017
 
2016
Utility plant in service
$
379,970

 
$
380,406

Accumulated depreciation
(255,604
)
 
(249,359
)
See Note 9 for further discussion of AROs.