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Retirement Plans - Expenses Incurred And Charged Against Operations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]      
Pension plan termination expense     $ 9,526
Employee savings plan/ 401(k) $ 14,991 $ 10,962 6,659
Supplemental executive retirement plan 3,475 2,862 2,343
Post-retirement benefits 67 43 144
Non-contributory defined benefit pension plan      
Defined Benefit Plan Disclosure [Line Items]      
Expenses incurred and charged against operations $ 18,533 $ 13,867 $ 18,672