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Employee Benefit Plans - Components of Net Periodic Benefit Cost (Credit) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Defined Benefit Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 851 $ 848 $ 2,548 $ 2,548
Interest cost 5,059 5,234 15,142 15,670
Expected return on plan assets (4,693) (5,103) (14,052) (15,280)
Amortization of prior service cost (credit) 49 37 145 112
Recognized actuarial gain (loss) (1,950) (1,467) (5,836) (4,399)
Net periodic benefit cost (credit) 3,216 2,483 9,619 7,449
Postretirement Benefit Plans        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost 45 45 135 134
Amortization of prior service cost (credit) (509) (509) (1,528) (1,528)
Recognized actuarial gain (loss) 48 57 143 170
Net periodic benefit cost (credit) $ (512) $ (521) $ (1,536) $ (1,564)