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Segmented Information (Schedule of Revenue and Net income by Segment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting [Line Items]
Revenue	$ 1,733,808	$ 1,416,971	$ 1,377,260
Selling, general and administrative	539,933	456,203	410,291
Acquisition-related costs	37,261	30,197	6,014
Depreciation and amortization	97,155	87,889	74,921
Foreign exchange loss (gain)	(954)	792	1,612
Total operating expenses	1,450,096	1,178,260	1,115,659
Gain on disposition of property, plant and equipment	170,833	1,436	1,559
Operating income	454,545	240,147	263,160
Interest expense	(57,880)	(36,993)	(35,568)
Interest income	6,971	1,402	2,337
Change in fair value of derivatives, net	1,263	(1,248)
Other income, net	1,089	1,924	5,959
Income tax expense	(86,230)	(53,378)	(65,530)
Net income	319,758	151,854	170,358
Operating Segments [Member]
Segment Reporting [Line Items]
Revenue	1,733,808	1,416,971	1,377,260
Selling, general and administrative	539,933	456,203	410,291
Segment profit	417,174	357,589	344,148
Acquisition-related costs	37,261	30,197	6,014
Depreciation and amortization	97,155	87,889	74,921
Foreign exchange loss (gain)	(954)	792	1,612
Total operating expenses	1,450,096	1,178,260	1,115,659
Gain on disposition of property, plant and equipment	170,833	1,436	1,559
Operating income	454,545	240,147	263,160
Interest expense	(57,880)	(36,993)	(35,568)
Interest income	6,971	1,402	2,337
Change in fair value of derivatives, net	1,263	(1,248)
Other income, net	1,089	1,924	5,959
Income tax expense	(86,230)	(53,378)	(65,530)
Net income	319,758	151,854	170,358
Auctions and Marketplaces [Member] | Operating Segments [Member]
Segment Reporting [Line Items]
Revenue	1,535,220	1,262,338	1,250,321
Selling, general and administrative	466,251	406,360	382,254
Segment profit	355,493	310,634	306,542
Other Reporting Unit [Member] | Operating Segments [Member]
Segment Reporting [Line Items]
Revenue	198,588	154,633	126,939
Selling, general and administrative	73,682	49,843	28,037
Segment profit	61,681	46,955	37,606
Service Revenues [Member]
Segment Reporting [Line Items]
Revenue	1,050,583	917,759	871,596
Direct expenses	168,127	155,258	164,528
Service Revenues [Member] | Operating Segments [Member]
Segment Reporting [Line Items]
Revenue	1,050,583	917,759	871,596
Direct expenses	168,127	155,258	164,528
Service Revenues [Member] | Auctions and Marketplaces [Member] | Operating Segments [Member]
Segment Reporting [Line Items]
Revenue	851,995	763,126	744,657
Direct expenses	104,902	97,423	103,232
Service Revenues [Member] | Other Reporting Unit [Member] | Operating Segments [Member]
Segment Reporting [Line Items]
Revenue	198,588	154,633	126,939
Direct expenses	63,225	57,835	61,296
Commissions
Segment Reporting [Line Items]
Revenue	485,916	469,718	452,882
Commissions | Operating Segments [Member]
Segment Reporting [Line Items]
Revenue	485,916	469,718	452,882
Commissions | Auctions and Marketplaces [Member] | Operating Segments [Member]
Segment Reporting [Line Items]
Revenue	485,916	469,718	452,882
Fees | Operating Segments [Member]
Segment Reporting [Line Items]
Revenue	564,667	448,041	418,714
Fees | Auctions and Marketplaces [Member] | Operating Segments [Member]
Segment Reporting [Line Items]
Revenue	366,079	293,408	291,775
Fees | Other Reporting Unit [Member] | Operating Segments [Member]
Segment Reporting [Line Items]
Revenue	198,588	154,633	126,939
Inventory Sales Revenue [Member]
Segment Reporting [Line Items]
Revenue	683,225	499,212	505,664
Direct expenses	608,574	447,921	458,293
Inventory Sales Revenue [Member] | Operating Segments [Member]
Segment Reporting [Line Items]
Revenue	683,225	499,212	505,664
Direct expenses	608,574	447,921	458,293
Inventory Sales Revenue [Member] | Auctions and Marketplaces [Member] | Operating Segments [Member]
Segment Reporting [Line Items]
Revenue	683,225	499,212	505,664
Direct expenses	$ 608,574	$ 447,921	$ 458,293

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