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Other Current Assets (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Period to settle advances against auction contracts 14 days    
Proceeds on disposition of assets $ 16,385 $ 5,929 $ 10,586
United States [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Proceeds on disposition of assets 15,555    
Gain on sale of assets $ 1,090 $ 571  
Canada and United States [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Gain on sale of assets     $ 1,439