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Retirement Plans, Expected Employer Contribution and Benefit Payments (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Pension Plan [Member] |  |
Expected employer contributions [Abstract] |  |
First year | $ 2,395 | $ 0
Expected benefit payments (gross) [Abstract] |  |
Year one | 12,209 | 9,483
Year two | 13,108 | 10,131
Year three | 13,959 | 10,818
Year four | 14,959 | 11,608
Year five | 16,052 | 12,377
Next five years | 96,547 | 75,717
SERP [Member] |  |
Expected employer contributions [Abstract] |  |
First year | 162 | 162
Expected benefit payments (gross) [Abstract] |  |
Year one | 162 | 162
Year two | 159 | 159
Year three | 155 | 156
Year four | 130 | 152
Year five | 104 | 149
Next five years | 447 | 462
Other Postretirement Benefits [Member] |  |
Expected employer contributions [Abstract] |  |
First year | 66 | 48
Expected benefit payments (gross) [Abstract] |  |
Year one | 66 | 55
Year two | 68 | 56
Year three | 69 | 58
Year four | 57 | 58
Year five | 56 | 46
Next five years | $ 261 | $ 214

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- Definition Amount of benefits for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following latest fiscal year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of benefits for defined benefit plan expected to be paid in next fiscal year following latest fiscal year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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