Supplemental cash flow information (Schedule of Supplemental cash flow) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Supplemental Cash Flow Information [Abstract]
Interest paid, net of interest capitalized	$ 35,956	$ 31,054
Interest received	3,242	1,010
Net income taxes paid	19,164	56,016
Non-cash purchase of property, plant and equipment under finance lease	7,543	6,173
Non-cash right of use assets obtained in exchange for new lease obligations	$ 19,895	$ 13,545