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Employee Benefit Plans - Components of Net Periodic Benefit Cost (Credit) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Defined Benefit Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 859 $ 843
Interest cost 5,053 5,198
Expected return on plan assets (4,681) (5,080)
Amortization of prior service cost 48 37
Recognized actuarial loss 1,943 1,465
Net periodic benefit cost (credit) 3,222 2,463
Postretirement Benefit Plans    
Defined Benefit Plan Disclosure [Line Items]    
Interest cost 45 45
Amortization of prior service cost (509) (509)
Recognized actuarial loss (48) (57)
Net periodic benefit cost (credit) $ (512) $ (521)