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Employee Benefit Plans - Components of Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Net periodic benefit cost $ 3,209 $ 3,695 $ 6,999 $ 7,666
Defined contribution plan        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Net periodic benefit cost 3,871 3,702 8,324 7,680
Defined benefit plans        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Interest cost 4,333 4,103 8,666 8,206
Expected return on plan assets, net of expenses (6,224) (5,820) (12,448) (11,640)
Amortization of actuarial loss and prior service cost 1,015 1,486 2,029 2,973
Total for defined benefit pension plan (876) (231) (1,753) (461)
SERPs        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Net periodic benefit cost $ 214 $ 224 $ 428 $ 447