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Operating expenses (Schedule of Acquisition Related Costs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Acquisition-related costs	$ 30,197	$ 6,014	$ 777
SmartEquip [Member]
Acquisition-related costs	4,965
SmartEquip [Member] | Employment Costs [Member]
Acquisition-related costs	439
SmartEquip [Member] | Other Related Costs [Member]
Acquisition-related costs	4,526
Euro Auctions Limited [Member]
Acquisition-related costs	13,596
Euro Auctions Limited [Member] | Other Related Costs [Member]
Acquisition-related costs	13,596
Rouse Services LLC [Member]
Acquisition-related costs	11,636	6,014
Rouse Services LLC [Member] | Employment Costs [Member]
Acquisition-related costs	10,332	802
Rouse Services LLC [Member] | Other Related Costs [Member]
Acquisition-related costs	$ 1,304	$ 5,212
Iron Planet Holdings Inc. [Member] | Other Related Costs [Member]
Acquisition-related costs			82
Other Acquisitions [Member]
Acquisition-related costs			777
Other Acquisitions [Member] | Employment Costs [Member]
Acquisition-related costs			128
Other Acquisitions [Member] | Other Related Costs [Member]
Acquisition-related costs			$ 567

X

- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 23
-URI http://asc.fasb.org/extlink&oid=123586518&loc=d3e1043-128460

+ Details

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