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Retirement Plans, Expected Employer Contribution and Benefit Payments (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Pension Plan [Member] |  |
Expected employer contributions [Abstract] |  |
First year | $ 145 | $ 2,385
Expected benefit payments (gross) [Abstract] |  |
Year one | 15,480 | 13,902
Year two | 16,678 | 14,902
Year three | 17,598 | 16,123
Year four | 18,382 | 17,284
Year five | 19,127 | 18,315
Next five years | 109,845 | 106,400
SERP [Member] |  |
Expected employer contributions [Abstract] |  |
First year | 0 | 0
Expected benefit payments (gross) [Abstract] |  |
Year one | 130 | 162
Year two | 104 | 136
Year three | 100 | 110
Year four | 96 | 106
Year five | 91 | 101
Next five years | 381 | 406
Other Postretirement Benefits [Member] |  |
Expected employer contributions [Abstract] |  |
First year | 0 | 0
Expected benefit payments (gross) [Abstract] |  |
Year one | 50 | 59
Year two | 49 | 49
Year three | 48 | 48
Year four | 47 | 47
Year five | 45 | 46
Next five years | $ 194 | $ 202

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- Definition Amount of benefit for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following current fiscal year. + 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 (f) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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