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Retirement Plans (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Oct. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Retirement Plans [Abstract] |  |  |  |  |
Service period of participants not impacted by pension plan amendment |  |  |  | 15 years |
Age of plan participants not impacted by pension plan amendment |  |  |  | 50 years |
Service period of participants who are age fifty not impacted by pension plan amendment |  |  |  | 10 years |
Pension plan defined benefit plan cost increase limit percentage |  |  |  | 4.00% |
Higman [Member] | Plan 2019 [Member] |  |  |  |  |
Retirement Plans [Abstract] |  |  |  |  |
Pension contributions |  |  |  | $ 797,000 |
Higman [Member] | Plan 2020 [Member] |  |  |  |  |
Retirement Plans [Abstract] |  |  |  |  |
Pension contributions |  |  |  | 958,000 |
Higman [Member] | Plan 2020 [Member] | Subsequent Event [Member] |  |  |  |  |
Retirement Plans [Abstract] |  |  |  |  |
Pension contributions | $ 480,000 |  |  |  |
Pension Plan [Member] |  |  |  |  |
Components of net periodic benefit cost [Abstract] |  |  |  |  |
Service cost |  | $ 1,917,000 | $ 1,841,000 | 5,753,000 | $ 5,523,000
Interest cost |  | 3,919,000 | 4,123,000 | 11,758,000 | 12,370,000
Expected return on plan assets |  | (5,960,000) | (5,239,000) | (17,883,000) | (15,717,000)
Amortization of actuarial (loss) gain |  | 994,000 | 359,000 | 1,651,000 | 1,078,000
Net periodic benefit cost |  | 870,000 | 1,084,000 | 1,279,000 | 3,254,000
SERP [Member] |  |  |  |  |
Components of net periodic benefit cost [Abstract] |  |  |  |  |
Service cost |  | 0 | 0 | 0 | 0
Interest cost |  | 10,000 | 13,000 | 30,000 | 39,000
Expected return on plan assets |  | 0 | 0 | 0 | 0
Amortization of actuarial (loss) gain |  | 8,000 | 7,000 | 26,000 | 21,000
Net periodic benefit cost |  | 18,000 | 20,000 | 56,000 | 60,000
Other Postretirement Benefits [Member] |  |  |  |  |
Components of net periodic benefit cost [Abstract] |  |  |  |  |
Service cost |  | 0 | 0 | 0 | 0
Interest cost |  | 6,000 | 7,000 | 17,000 | 23,000
Amortization of actuarial (loss) gain |  | (131,000) | (135,000) | (392,000) | (405,000)
Net periodic benefit cost |  | $ (125,000) | $ (128,000) | $ (375,000) | $ (382,000)

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- Definition The service period of eligible participants of the employee pension plan who have reached the age of fifty that will be grandfathered and not be impacted by the amendment to the pension plan. + References No definition available. + Details
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- Definition The service period of eligible participants of the employee pension plan who will be grandfathered and not be impacted by the amendment to the pension plan. + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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