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Cash flow information (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Supplemental Cash Flow Information [Abstract]
Interest, net*	$ 28,442,000	$ 15,657,000
Income taxes paid (refunded), net	8,122,000	(363,000)
AFUDC borrowed	2,400,000	586,000
Right-of-use assets obtained in exchange for new operating lease liabilities	15,095,000	10,175,000	$ 50,921,000
Property, plant and equipment additions in accounts payable	32,171,000	25,730,000	49,602,000
Accrual for holdback payment related to a business combination	0	0	70,000
Stock issued in connection with a business combination	$ 0	$ 0	$ 7,304,000

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Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.

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Amount of tangible or intangible assets, including a business or subsidiary of the acquirer transferred by the entity to the former owners of the acquiree. Excludes cash.

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