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Acquisitions (Assets Acquired and Liabilities Assumed) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]      
Goodwill $ 256,283 $ 256,320 $ 259,399
2017 and 2018 Acquisitions      
Business Acquisition [Line Items]      
Trade receivables, net 328    
Inventories 153,422    
Property and equipment 9,201    
Other assets 174,474    
Floor plan notes payable (10,661)    
Other liabilities (2,397)    
Assets acquired and liabilities assumed 324,367    
Goodwill 0    
Assets acquired and liabilities assumed, net $ 324,367