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Retirement Plans (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
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] |  |  |  |
Retirement Plans [Abstract] |  |  |  |
Pension contributions |  |  | $ 479,000 |
Pension Plans [Member] |  |  |  |
Components of net periodic benefit cost [Abstract] |  |  |  |
Service cost | $ 2,053 | $ 1,919 | 3,980 | $ 3,836
Interest cost | 3,535 | 3,949 | 7,119 | 7,839
Expected return on plan assets | (6,559) | (5,735) | (13,133) | (11,923)
Amortization of actuarial loss (gain) | 790 | 425 | 1,888 | 657
Net periodic benefit cost | (181) | 558 | (146) | 409
SERP [Member] |  |  |  |
Components of net periodic benefit cost [Abstract] |  |  |  |
Service cost | 0 | 0 | 0 | 0
Interest cost | 7 | 10 | 15 | 20
Expected return on plan assets | 0 | 0 | 0 | 0
Amortization of actuarial loss (gain) | 10 | 9 | 20 | 18
Net periodic benefit cost | 17 | 19 | 35 | 38
Other Postretirement Benefits [Member] |  |  |  |
Components of net periodic benefit cost [Abstract] |  |  |  |
Service cost | 0 | 0 | 0 | 0
Interest cost | 4 | 5 | 8 | 11
Amortization of actuarial loss (gain) | (112) | (130) | (225) | (261)
Net periodic benefit cost | $ (108) | $ (125) | $ (217) | $ (250)

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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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