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Retirement Plans and Other Postretirement Benefits - Components of Net Periodic Cost, Changes in Plan Assets and Benefit Obligations, and AOCI Impacts (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plan |  |  |
Service cost: |  |  |
Benefit accrual | $ 0 | $ 0 | $ 0
Other expenses | 650 | 650 | 650
Interest cost | 731 | 997 | 947
Expected return on plan assets | (966) | (1,222) | (1,377)
Settlement loss | 447 | 0 | 0
Amortization of: |  |  |
Prior service cost | 0 | 0 | 0
Actuarial loss | 342 | 310 | 371
Net periodic pension expense | 1,204 | 735 | 591
Changes in plan assets and benefit obligations included in other comprehensive income (loss): |  |  |
Prior service cost | 0 | 0 | 0
Net actuarial loss (gain) | 277 | (1,755) | 177
Amortization of: |  |  |
Prior service cost | 0 | 0 | 0
Actuarial loss | (790) | (310) | (371)
Total recognized in other comprehensive income (loss) | $ (513) | $ (2,065) | $ (194)
Weighted average assumptions used to determine expense: |  |  |
Discount rate | 3.10% | 4.20% | 3.50%
Expected return on plan assets | 4.80% | 5.75% | 5.90%
Weighted average assumptions used to determine benefit obligations as of December 31: |  |  |
Discount rate | 2.08% | 3.10% | 4.20%
Expected return on plan assets | 4.80% | 5.75% | 5.90%
Supplemental Defined Benefit Plans |  |  |
Service cost: |  |  |
Benefit accrual | $ 0 | $ 0 | $ 0
Other expenses | 0 | 0 | 0
Interest cost | 453 | 620 | 566
Expected return on plan assets | 0 | 0 | 0
Settlement loss | 0 | 0 | 0
Amortization of: |  |  |
Prior service cost | 0 | 0 | 0
Actuarial loss | 302 | 256 | 310
Net periodic pension expense | 755 | 876 | 876
Changes in plan assets and benefit obligations included in other comprehensive income (loss): |  |  |
Prior service cost | 0 | 0 | 0
Net actuarial loss (gain) | 1,318 | 516 | (789)
Amortization of: |  |  |
Prior service cost | 0 | 0 | 0
Actuarial loss | (302) | (256) | (310)
Total recognized in other comprehensive income (loss) | $ 1,016 | $ 260 | $ (1,099)
Weighted average assumptions used to determine expense: |  |  |
Discount rate | 3.10% | 4.20% | 3.50%
Weighted average assumptions used to determine benefit obligations as of December 31: |  |  |
Discount rate | 2.08% | 3.10% | 4.20%

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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 cost recognized for passage of time related to defined benefit plan. + 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 (h)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: 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 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 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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