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Cash flow information (Details) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Supplemental Cash Flow Information [Abstract]      
Interest, net* $ 45,870,000 $ 47,769,000  
Income taxes paid, net 46,734,000 735,000  
AFUDC borrowed 816,000 1,300,000  
Right-of-use assets obtained in exchange for new operating lease liabilities 17,224,000 24,181,000 $ 54,356,000
Property, plant and equipment additions in accounts payable 31,886,000 36,493,000 26,082,000
Accrual for holdback payment related to a business combination $ 0 $ 5,000,000 $ 2,500,000