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Capitalization (Tables)
6 Months Ended
Jun. 30, 2018
CAPITALIZATION:  
Schedule of carrying amount and fair value of bonds

The carrying amount and fair value of the Bonds were as follows:

 

 

  June 30, 2018 December 31, 2017
  Carrying Fair Carrying Fair
  Amount Value Amount Value
Bonds $  104,449 $ 106,188 $95,322  $98,036