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Employee Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Defined Benefit Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 858 $ 1,019 $ 1,701 $ 2,066
Interest cost 5,237 3,039 10,435 6,116
Expected return on plan assets (5,097) (4,826) (10,177) (9,704)
Amortization of prior service cost (credit) 38 73 75 113
Recognized actuarial loss (gain) 1,467 2,344 2,932 4,591
Net periodic benefit cost (credit) 2,503 1,649 4,966 3,182
Postretirement Benefit Plans        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost 45 22 90 44
Amortization of prior service cost (credit) (509) (509) (1,018) (1,018)
Recognized actuarial loss (gain) (57) (25) (114) (50)
Net periodic benefit cost (credit) $ (521) $ (512) $ (1,042) $ (1,024)