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Retirement Plans, Expected Employer Contribution and Benefit Payments (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Pension Plan [Member] |  |
Expected employer contributions [Abstract] |  |
First year | $ 2,385 | $ 2,407
Expected benefit payments (gross) [Abstract] |  |
Year one | 13,902 | 12,063
Year two | 14,902 | 13,123
Year three | 16,123 | 14,300
Year four | 17,284 | 15,572
Year five | 18,315 | 16,857
Next five years | 106,400 | 100,587
SERP [Member] |  |
Expected employer contributions [Abstract] |  |
First year | 0 | 0
Expected benefit payments (gross) [Abstract] |  |
Year one | 162 | 162
Year two | 136 | 158
Year three | 110 | 133
Year four | 106 | 107
Year five | 101 | 103
Next five years | 406 | 426
Other Postretirement Benefits [Member] |  |
Expected employer contributions [Abstract] |  |
First year | 0 | 0
Expected benefit payments (gross) [Abstract] |  |
Year one | 59 | 61
Year two | 49 | 62
Year three | 48 | 51
Year four | 47 | 51
Year five | 46 | 49
Next five years | $ 202 | $ 220

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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=118255775&loc=d3e1928-114920 + Details
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