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Capitalization (Tables)
9 Months Ended
Sep. 30, 2015
Capitalization [Abstract]  
Schedule of carrying amount and fair value of bonds
September 30, 2015 December 31, 2014
Carrying Fair   Carrying   Fair
Amount Value   Amount   Value
First Mortgage Bonds $ 85,143     $ 87,054     $ 88,628     $ 90,115  
SRF Bonds   $ 457     $ 459     $ 540     $ 542