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Pensions (Details) - Pension Plans [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Components of Net Periodic Benefit Cost [Abstract]
Service cost	$ 234	$ 213	$ 703	$ 637
Interest cost	365	412	1,093	1,234
Expected return on plan assets	(800)	(684)	(2,399)	(2,050)
Amortization of actuarial loss	92	106	277	316
Amortization of prior service credit	(3)	(4)	(9)	(10)
Rate-regulated adjustment	687	532	2,060	1,598
Net periodic pension expense	575	$ 575	1,725	$ 1,725
Employer Contributions [Abstract]
Estimated employer contributions in 2020					$ 2,300
Contributions made by employer			1,725
Estimated future contributions in 2020	$ 575		$ 575

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