Segmented information (Geographic Information of Revenue and location of assets) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 331,555	$ 273,255
Property, plant and equipment	483,981		$ 492,127
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	207,414	190,530
Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	48,478	35,643
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	47,176	26,338
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 28,487	$ 20,744