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Pensions (Details) - Pension Plans [Member] - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Components of Net Periodic Pension Cost [Abstract] |  |  |  |  |
Service cost | $ 257 | $ 271 | $ 769 | $ 814 |
Interest cost | 334 | 302 | 1,002 | 906 |
Expected return on plan assets | (1,054) | (913) | (3,163) | (2,739) |
Amortization of actuarial loss | 0 | 121 | 0 | 363 |
Amortization of prior service cost | (4) | (3) | (10) | (9) |
Rate-regulated adjustment | 1,042 | 797 | 3,127 | 2,390 |
Net periodic pension expense | 575 | $ 575 | 1,725 | $ 1,725 |
Employer Contributions [Abstract] |  |  |  |  |
Estimated employer contributions in 2022 |  |  |  |  | $ 2,300
Contributions made by employer |  |  | 1,725 |  |
Estimated employer contributions in final quarter of 2022 | $ 575 |  | $ 575 |  |

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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4587-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123453770&loc=SL108413299-114919 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)(3) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 + Details
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