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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

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- Definition Amount of cost of providing special or contractual termination benefits payable from defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (q) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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