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Cash flow information (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Supplemental Cash Flow Information [Abstract]
Interest, net*	$ 14,303,000	$ 15,978,000
Income taxes paid (refunded), net	13,880,000	(1,000)
AFUDC borrowed	348,000	627,000
Right-of-use assets obtained in exchange for new operating lease liabilities	9,236,000	10,655,000	$ 54,356,000
Property, plant and equipment additions in accounts payable	20,594,000	27,425,000	26,082,000
Accrual for holdback payment related to a business combination	$ 0	$ 5,000,000	$ 2,500,000

X

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Future cash outflow to pay for purchases of fixed assets that have occurred.

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