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Segments (Reconciliation of Assets from Segment to Consolidated) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Segment Reporting Information [Line Items]    
Total Assets $ 5,164,162 $ 4,683,066
Operating segments | Domestic    
Segment Reporting Information [Line Items]    
Total Assets 1,380,823 1,224,276
Operating segments | Import    
Segment Reporting Information [Line Items]    
Total Assets 1,244,218 1,032,665
Operating segments | Luxury    
Segment Reporting Information [Line Items]    
Total Assets 690,774 604,023
Corporate and other    
Segment Reporting Information [Line Items]    
Total Assets $ 1,848,347 $ 1,822,102