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Segmented information (Schedule of Revenue and Net income by Segment) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting [Line Items]      
Revenue $ 1,416,971 $ 1,377,260 $ 1,318,641
Selling, general and administrative expenses ("SG&A") 464,599 417,523 382,389
Acquisition-related costs 30,197 6,014 777
Depreciation and amortization expenses ("D&A") 87,889 74,921 70,501
Gain on disposition of property, plant and equipment ("PPE") (1,436) (1,559) (1,107)
Foreign exchange loss 792 1,612 (2,937)
Operating income 240,147 263,160 223,202
Interest expense (36,993) (35,568) (41,277)
Change in fair value of derivatives (1,248)    
Other income, net 3,326 8,296 8,838
Income tax expense (53,378) (65,530) (41,623)
Net income 151,854 170,358 149,140
Operating Segments [Member]      
Segment Reporting [Line Items]      
Revenue 1,416,971 1,377,260 1,318,641
Selling, general and administrative expenses ("SG&A") 464,599 417,523 382,389
Segment profit 357,589 344,148 290,436
Acquisition-related costs 30,197 6,014 777
Depreciation and amortization expenses ("D&A") 87,889 74,921 70,501
Gain on disposition of property, plant and equipment ("PPE") (1,436) (1,559) (1,107)
Foreign exchange loss 792 1,612 (2,937)
Operating income 240,147 263,160 223,202
Interest expense (36,993) (35,568) (41,277)
Change in fair value of derivatives (1,248)    
Other income, net 3,326 8,296 8,838
Income tax expense (53,378) (65,530) (41,623)
Net income 151,854 170,358 149,140
Auctions and Marketplaces [Member] | Operating Segments [Member]      
Segment Reporting [Line Items]      
Revenue 1,258,515 1,245,707 1,193,440
Selling, general and administrative expenses ("SG&A") 414,287 388,442 358,016
Segment profit 310,892 306,777 254,764
Other Reporting Unit [Member] | Operating Segments [Member]      
Segment Reporting [Line Items]      
Revenue 158,456 131,553 125,201
Selling, general and administrative expenses ("SG&A") 50,312 29,081 24,373
Segment profit 46,697 37,371 35,672
Service Revenues [Member]      
Segment Reporting [Line Items]      
Revenue 917,759 871,596 804,024
Direct expenses 146,862 157,296 164,977
Service Revenues [Member] | Operating Segments [Member]      
Segment Reporting [Line Items]      
Revenue 917,759 871,596 804,024
Direct expenses 146,862 157,296 164,977
Service Revenues [Member] | Auctions and Marketplaces [Member] | Operating Segments [Member]      
Segment Reporting [Line Items]      
Revenue 759,303 740,043 678,823
Direct expenses 85,415 92,195 99,821
Service Revenues [Member] | Other Reporting Unit [Member] | Operating Segments [Member]      
Segment Reporting [Line Items]      
Revenue 158,456 131,553 125,201
Direct expenses 61,447 65,101 65,156
Inventory Sales Revenue [Member]      
Segment Reporting [Line Items]      
Revenue 499,212 505,664 514,617
Direct expenses 447,921 458,293 480,839
Inventory Sales Revenue [Member] | Operating Segments [Member]      
Segment Reporting [Line Items]      
Revenue 499,212 505,664 514,617
Direct expenses 447,921 458,293 480,839
Inventory Sales Revenue [Member] | Auctions and Marketplaces [Member] | Operating Segments [Member]      
Segment Reporting [Line Items]      
Revenue 499,212 505,664 514,617
Direct expenses $ 447,921 $ 458,293 $ 480,839