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Pensions (Details) - Pension Plans [Member] - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Components of Net Periodic Pension Cost [Abstract] |  |  |
Service cost | $ 159 | $ 149 |
Interest cost | 463 | 469 |
Expected return on plan assets | (791) | (903) |
Amortization of prior service cost | (3) | (3) |
Rate-regulated adjustment | 561 | 801 |
Net periodic pension expense | 389 | $ 513 |
Employer Contributions [Abstract] |  |  |
Estimated employer contributions in 2024 |  |  | $ 1,556
Employer contributions made in 2024 | 389 |  |
Estimated remaining employer contributions in 2024 | $ 1,167 |  |

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- Definition Amount of contributions received and expected to be received by defined benefit plan from employer in current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-18 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-6 + Details
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