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Capitalization (Tables)
9 Months Ended
Sep. 30, 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)
    September 30, 2024   December 31, 2023
    Carrying   Fair   Carrying   Fair
    Amount   Value   Amount   Value
FMBs   $ 129,602     $ 127,760     $ 133,374     $ 131,745