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Jointly Owned Electric Facilities (Tables)
12 Months Ended
Dec. 31, 2012
Jointly Owned Utility Plant, Net Ownership Amount [Abstract]  
Schedule Of Jointly Owned Electric Facilities
 
2012
 
2011
Utility plant in service
$
344,958

 
$
342,539

Accumulated depreciation
(234,126
)
 
(225,746
)