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Pensions (Details) - Pension Plans [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Components of Net Periodic Pension Cost [Abstract]
Service cost	$ 158	$ 150	$ 317	$ 299
Interest cost	465	469	928	938
Expected return on plan assets	(792)	(903)	(1,583)	(1,806)
Amortization of prior service cost	(3)	(3)	(6)	(6)
Rate-regulated adjustment	(106)	676	455	1,477
Net periodic pension cost	(278)	$ 389	111	$ 902
Employer Contributions [Abstract]
Estimated employer contributions in 2024					$ 1,556
Employer contributions made in 2024			111
Estimated remaining employer contributions in 2024	0		0
Maximum [Member]
Employer Contributions [Abstract]
Estimated employer contributions in 2024	$ 111		$ 111

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