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Pensions (Details) - Pension Plans [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Components of Net Periodic Pension Cost [Abstract]
Service cost	$ 159	$ 150	$ 476	$ 449
Interest cost	464	469	1,392	1,407
Expected return on plan assets	(791)	(903)	(2,374)	(2,709)
Amortization of prior service cost	(4)	(4)	(10)	(10)
Rate-regulated adjustment	172	677	627	2,154
Net periodic pension cost	0	$ 389	111	$ 1,291
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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