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Capitalization (Tables)
6 Months Ended
Jun. 30, 2023
Capitalization [Abstract]  
Schedule of carrying amount and fair value of the bonds
   (Thousands of Dollars)
   June 30, 2023  December 31, 2022
   Carrying  Fair  Carrying  Fair
   Amount  Value  Amount  Value
 FMBs   $146,496   $141,748   $147,269   $138,756