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Goodwill impairment testing results (Details 4) - USD ($) $ in Thousands	Dec. 31, 2022	Oct. 31, 2022	Dec. 31, 2021	Oct. 31, 2021	Dec. 31, 2020
Goodwill [Line Items]
Goodwill	$ 763,500		$ 765,386		$ 714,963
Natural gas distribution
Goodwill [Line Items]
Goodwill	$ 345,736		$ 345,736		$ 345,736
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount		8.00%
Risk Adjusted Cost of Capital, Percent		6.40%		5.00%

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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