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Pensions (Details) - Pension Plans [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Components of Net Periodic Pension Cost [Abstract]
Service cost	$ 271	$ 234	$ 814	$ 703
Interest cost	302	365	906	1,093
Expected return on plan assets	(913)	(800)	(2,739)	(2,399)
Amortization of actuarial loss	121	92	363	277
Amortization of prior service cost	(3)	(3)	(9)	(9)
Rate-regulated adjustment	797	687	2,390	2,060
Net periodic pension expense	575	$ 575	1,725	$ 1,725
Employer Contributions [Abstract]
Estimated employer contributions in 2021					$ 2,300
Contributions made by employer			1,725
Estimated future contributions in 2021	$ 575		$ 575

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