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Postretirement Benefit Obligations - Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Retirement Benefits [Abstract]      
Service cost $ 4,877 $ 4,906 $ 6,860
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent
Interest cost $ 4,524 $ 4,048 $ 2,436
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent
Expected return on plan assets $ (4,884) $ (4,396) $ (4,463)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Immediate Recognition of Actuarial Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent
Recognition of actuarial losses $ 0 $ 0 $ 0
Net periodic Pension Cost 4,517 4,558 4,833
Other changes in benefits obligations recognized in other comprehensive loss (income)      
Actuarial losses (gains) (13,455) (184) (2,157)
Total recognized in other comprehensive income (13,455) (184) (2,157)
Total net periodic pension cost (benefit) recognized in Other comprehensive income $ (8,938) $ 4,374 $ 2,676