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Employee Benefit Plans - Components of Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Net periodic benefit cost $ 3,924 $ 3,693 $ 12,980 $ 12,280
Defined benefit plans        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Interest cost 5,650 5,628 16,948 16,833
Expected return on plan assets, net of expenses (5,558) (6,018) (16,675) (18,054)
Amortization of actuarial loss and prior service cost 4 5 13 14
Total for defined benefit pension plan 96 (385) 286 (1,207)
SERPs        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Net periodic benefit cost 242 233 727 701
Defined contribution plan        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Net periodic benefit cost $ 3,586 $ 3,845 $ 11,967 $ 12,786