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Pensions (Details) - Pension Plans [Member] - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Components of Net Periodic Pension Cost [Abstract] |  |  |  |  |
Service cost | $ 132 | $ 158 | $ 265 | $ 317 |
Interest cost | 496 | 465 | 991 | 928 |
Expected return on plan assets | (767) | (792) | (1,534) | (1,583) |
Amortization of prior service cost | (3) | (3) | (6) | (6) |
Rate-regulated adjustment | 142 | (106) | 284 | 455 |
Net periodic pension cost | 0 | $ (278) | 0 | $ 111 |
Employer Contributions [Abstract] |  |  |  |  |
Estimated employer contributions in 2025 |  |  |  |  | $ 0
Employer contributions made in 2025 |  |  | 0 |  |
Estimated remaining employer contributions in 2025 | $ 0 |  | $ 0 |  |

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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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