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Jointly Owned Electric Facilities (Tables)
12 Months Ended
Dec. 31, 2019
Jointly Owned Utility Plant, Net Ownership Amount [Abstract]  
Schedule Of Jointly Owned Electric Facilities The Company’s share of utility plant in service for Colstrip and accumulated depreciation (inclusive of the ARO assets and accumulated amortization) were as follows as of December 31 (dollars in thousands):
 
2019
 
2018
Utility plant in service
$
387,860

 
$
384,431

Accumulated depreciation
(268,637
)
 
(261,997
)