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Employee Benefit Plans - Components of Net Periodic Benefit Cost (Credit) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Defined Benefit Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 830 $ 859
Interest cost 5,080 5,053
Expected return on plan assets (4,369) (4,681)
Amortization of prior service cost (credit) 49 48
Recognized actuarial gain (loss) (2,165) (1,943)
Net periodic benefit cost (credit) 3,755 3,222
Postretirement Benefit Plans    
Defined Benefit Plan Disclosure [Line Items]    
Interest cost 36 45
Amortization of prior service cost (credit) (499) (509)
Recognized actuarial gain (loss) 73 48
Net periodic benefit cost (credit) $ (536) $ (512)