Operating expenses (Schedule of Acquisition Related Costs) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Acquisition-related costs	$ 9,637	$ 2,922
SmartEquip [Member] | Employment Costs [Member]
Acquisition-related costs	659
SmartEquip [Member] | Other Related Costs [Member]
Acquisition-related costs	516
Euro Auctions Limited [Member] | Other Related Costs [Member]
Acquisition-related costs	6,693
Rouse Services LLC [Member] | Employment Costs [Member]
Acquisition-related costs	1,474	2,553
Rouse Services LLC [Member] | Other Related Costs [Member]
Acquisition-related costs	$ 295	$ 369