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Retirement Plans, Components of Net Periodic Benefit Cost, Pension Benefits (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Other changes in plan assets and benefit obligations recognized in other comprehensive income [Abstract] |  |  |
Recognition of actuarial loss | $ (44,491) | $ 31,755 | $ 6,548
Pension Plan [Member] |  |  |
Components of net periodic benefit cost [Abstract] |  |  |
Service cost | 7,961 | 7,671 | 7,364
Interest cost | 14,239 | 15,630 | 16,493
Expected return on plan assets | (26,244) | (23,790) | (20,956)
Amortization of actuarial loss | 4,193 | 2,399 | 1,438
Net periodic benefit cost | 149 | 1,910 | 4,339
Other changes in plan assets and benefit obligations recognized in other comprehensive income [Abstract] |  |  |
Current year actuarial loss | (44,583) | 31,616 | 6,497
Recognition of actuarial loss | (4,193) | (2,399) | (1,438)
Total recognized in other comprehensive income | (48,776) | 29,217 | 5,059
Total recognized in net periodic benefit cost and other comprehensive income | (48,627) | 31,127 | 9,398
SERP [Member] |  |  |
Components of net periodic benefit cost [Abstract] |  |  |
Service cost | 0 | 0 | 0
Interest cost | 31 | 40 | 52
Expected return on plan assets | 0 | 0 | 0
Amortization of actuarial loss | 40 | 35 | 28
Net periodic benefit cost | 71 | 75 | 80
Other changes in plan assets and benefit obligations recognized in other comprehensive income [Abstract] |  |  |
Current year actuarial loss | (12) | 55 | 73
Recognition of actuarial loss | (40) | (35) | (28)
Total recognized in other comprehensive income | (52) | 20 | 45
Total recognized in net periodic benefit cost and other comprehensive income | $ 19 | $ 95 | $ 125

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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=123453770&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=123447040&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=123450688&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=123450688&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=123447040&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=123450688&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=123450688&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=123447040&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=123453770&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=123447040&loc=d3e2709-114920 + Details
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