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Pensions (Details) - Pension Plans [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Components of Net Periodic Pension Cost [Abstract]
Service cost	$ 149	$ 256
Interest cost	469	334
Expected return on plan assets	(903)	(1,055)
Amortization of prior service cost	(3)	(3)
Rate-regulated adjustment	801	1,043
Net periodic pension expense	513	$ 575
Employer Contributions [Abstract]
Estimated employer contributions in 2023			$ 1,680
Employer contributions made in 2023	513
Estimated remaining employer contributions in 2023	$ 1,167

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