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Capitalization (Tables)
3 Months Ended
Mar. 31, 2024
Capitalization [Abstract]  
Schedule of Carrying Amount and Fair Value of the FMBs The carrying amount and fair value of the FMBs were as follows:
   (Thousands of Dollars)
   March 31, 2024  December 31, 2023
   Carrying  Fair  Carrying  Fair
   Amount  Value  Amount  Value
FMBs  $132,619   $129,092   $133,374   $131,745