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Other Current Assets (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Proceeds on disposition of assets $ 10,586 $ 4,985 $ 6,691
Period to settle advances against auction contracts 14 days    
Prince George, Canada and Albuquerque, United States [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Proceeds on disposition of assets $ 7,071    
Gain on sale of assets $ 1,439    
Orlando, United States, and Truro, Canada [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Gain on sale of assets   $ 602  
Denver, United States [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Gain on sale of assets     $ 493