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Business Combinations (Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended
May 31, 2017
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]          
Goodwill     $ 672,310 $ 671,594 $ 670,922
Iron Planet Holdings Inc. [Member]          
Business Acquisition [Line Items]          
Voting equity interests acquired, percentage 100.00%        
Cash consideration $ 772,706        
Total consideration 776,474        
Cash consideration, placed in escrow 35,000        
Noncash consideration 2,330        
Consideration, placed in escrow 1,771        
Amount released from escrow   $ 36,771      
Cash related to customary adjustments 333        
Goodwill 568,566        
Iron Planet Holdings Inc. [Member] | Consolidation, Eliminations [Member]          
Business Acquisition [Line Items]          
Consideration, placed in escrow $ 333