Operating expenses (Schedule of Acquisition Related Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Acquisition-related costs	$ 3,399	$ 3,049	$ 13,036	$ 5,971
SmartEquip [Member] | Employment Costs [Member]
Acquisition-related costs	668		1,326
SmartEquip [Member] | Other Related Costs [Member]
Acquisition-related costs			516
Euro Auctions Limited [Member] | Other Related Costs [Member]
Acquisition-related costs	1,317		8,012
Rouse Services LLC [Member] | Employment Costs [Member]
Acquisition-related costs	$ 1,414	2,678	2,887	5,231
Rouse Services LLC [Member] | Other Related Costs [Member]
Acquisition-related costs		$ 371	$ 295	$ 740