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Segmented information (Geographic Information of Revenue and location of assets) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue $ 1,416,971 $ 1,377,260 $ 1,318,641
Property, plant and equipment 449,087 492,127  
United States [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue 748,730 754,815 743,793
Property, plant and equipment 232,351 252,335  
Canada [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue 281,105 305,236 247,737
Property, plant and equipment 93,826 106,973  
Europe [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue 183,004 158,999 173,054
Property, plant and equipment 75,538 83,014  
Australia [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue 149,551 119,490 98,365
Property, plant and equipment 21,478 21,681  
Other [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue 54,581 38,720 $ 55,692
Property, plant and equipment $ 25,894 $ 28,124