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Pensions (Details) - Pension Plans [Member] - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Components of Net Periodic Pension Cost [Abstract] |  |  |  |  |
Service cost | $ 256 | $ 272 | $ 512 | $ 543 |
Interest cost | 334 | 302 | 668 | 604 |
Expected return on plan assets | (1,054) | (913) | (2,109) | (1,826) |
Amortization of actuarial loss | 0 | 121 | 0 | 242 |
Amortization of prior service cost | (3) | (3) | (6) | (6) |
Rate-regulated adjustment | 1,042 | 796 | 2,085 | 1,593 |
Net periodic pension expense | 575 | $ 575 | 1,150 | $ 1,150 |
Employer Contributions [Abstract] |  |  |  |  |
Estimated employer contributions in 2022 |  |  |  |  | $ 2,300
Contributions made by employer |  |  | 1,150 |  |
Estimated employer contributions in final two quarters of 2022 | $ 1,150 |  | $ 1,150 |  |

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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 http://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 http://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 http://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 http://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 http://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 + Details
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