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Capitalization (Tables)
 9 Months Ended
Sep. 30, 2023
Capitalization [Abstract]  
Schedule of Carrying Amount and Fair Value of the Bonds equivalents is classified as a Level 1 measurement and the fair value of notes payable and the FMBs in the table below are classified as Level 2 measurements. The carrying amount and fair value of the FMBs were as follows:
   (Thousands of Dollars)
   September 30, 2023  December 31, 2022
   Carrying  Fair  Carrying  Fair
   Amount  Value  Amount  Value
FMBs  $133,374   $123,235   $147,269   $138,756