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Benefit Plan (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Nov. 17, 2009
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer |  | $ 0 | $ 0 |  |
Defined Benefit Plan, Benefit Obligation |  | $ 139,217 | $ 127,394 | $ 182,964 |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate |  | 5.14% | 5.32% | 3.23% |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets |  | 6.92% | 6.92% | 7.00% |
Accumulated benefit obligation for the pension plan |  | $ 113,400 | $ 106,300 |  |
Common share purchased under pension plan, shares |  |  |  |  | 115,800
Common share purchased under pension plan, value |  |  |  |  | $ 7,000
Common share purchased under pension plan, value per share |  |  |  |  | $ 60.45
Fair value, pension plan common shares held, shares |  | 115,800 | 115,800 |  |
Fair value of common shares held by pension plan |  | $ 15,400 | $ 16,300 |  |
Fair value of common shares held by pension plan, per share |  | $ 132.86 | $ 140.75 |  |
Defined Contribution Plan, Cost |  | $ 5,000 | $ 4,600 | $ 4,300 |
Subsequent Event [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer | $ 0 |  |  |  |
Supplemental Executive Retirement Plan (SERP) |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Accrued benefit cost |  | $ 15,200 | $ 14,200 |  |

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-8 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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