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Operating Expenses (Schedule of Acquisition Related Costs) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2016
Acquisition-related costs $ 4,691 $ 5,440
Iron Planet Holdings Inc. [Member]    
Acquisition-related costs 4,514 4,514
Mascus International Holdings BV [Member]    
Acquisition-related costs   749
Petrowsky Auctioneers Inc. [Member]    
Acquisition-related costs $ 177 $ 177