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Fair Value Measurements: Other Fair Value Measurements (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Carrying Amount    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term Debt $ 4,479,409 $ 4,132,340
Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term Debt $ 4,205,369 $ 3,760,848