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Pensions (Details) - Pension Plans [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Components of Net Periodic Pension Cost [Abstract]
Service cost	$ 159	$ 149
Interest cost	463	469
Expected return on plan assets	(791)	(903)
Amortization of prior service cost	(3)	(3)
Rate-regulated adjustment	561	801
Net periodic pension expense	389	$ 513
Employer Contributions [Abstract]
Estimated employer contributions in 2024			$ 1,556
Employer contributions made in 2024	389
Estimated remaining employer contributions in 2024	$ 1,167

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