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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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Defined Benefit Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 1,019 $ 1,293 $ 2,066 $ 2,586
Interest cost 3,039 2,530 6,116 5,070
Expected return on plan assets (4,826) (4,637) (9,704) (9,264)
Amortization of prior service cost 73 119 113 230
Recognized actuarial loss 2,344 2,775 4,591 5,560
Net periodic benefit cost (credit) 1,649 2,080 3,182 4,182
Postretirement Benefit Plans        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost 22 19 44 39
Amortization of prior service cost (509) (509) (1,018) (1,019)
Recognized actuarial loss (25) (2) (50) (5)
Net periodic benefit cost (credit) $ (512) $ (492) $ (1,024) $ (985)