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Benefit Plans - Qualified and Non-Qualified Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Pension    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial (gain) loss $ (14,285) $ (7,596)
Amortization of prior service cost (135) (135)
Amortization of actuarial (loss) gain (234) (58)
Total recognized in other comprehensive loss (14,654) (7,789)
Total recognized in net periodic benefit (income) cost and other comprehensive (income) loss (before tax) (28,070) (21,465)
OPEB    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial (gain) loss 178 (161)
Amortization of prior service cost 0 0
Amortization of actuarial (loss) gain 60 54
Total recognized in other comprehensive loss 238 (107)
Total recognized in net periodic benefit (income) cost and other comprehensive (income) loss (before tax) $ 423 $ 118