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Other current assets (Schedule of Other Current Assets) (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Other current assets    
Advances against auction contracts $ 7,117 $ 6,487
Assets held for sale 242  
Prepaid expenses and deposits 20,417 20,787
Other Current Assets $ 27,776 $ 27,274