XML 149 R133.htm IDEA: XBRL DOCUMENT v3.20.4
Retirement Plans - Expenses Incurred And Charged Against Operations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Pension     $ (309)
Pension plan termination expense   $ 9,526  
Employee savings plan/ 401(k) $ 10,962 6,659 7,948
Supplemental executive retirement plan 2,862 2,343 368
Post-retirement benefits 43 144 254
Non-contributory defined benefit pension plan      
Defined Benefit Plan Disclosure [Line Items]      
Expenses incurred and charged against operations $ 13,867 $ 18,672 $ 8,261