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Pensions (Details) - Pension Plans [Member] - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Components of Net Periodic Pension Cost [Abstract] |  |  |  |  |
Service cost | $ 150 | $ 256 | $ 299 | $ 512 |
Interest cost | 469 | 334 | 938 | 668 |
Expected return on plan assets | (903) | (1,054) | (1,806) | (2,109) |
Amortization of prior service cost | (3) | (3) | (6) | (6) |
Rate-regulated adjustment | 676 | 1,042 | 1,477 | 2,085 |
Net periodic pension expense | 389 | $ 575 | 902 | $ 1,150 |
Employer Contributions [Abstract] |  |  |  |  |
Estimated employer contributions in 2023 |  |  |  |  | $ 1,680
Employer contributions made in 2023 |  |  | 902 |  |
Estimated remaining employer contributions in 2023 | $ 778 |  | $ 778 |  |

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