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Goodwill and Franchise Value (Schedule of Goodwill) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2008
Goodwill [Roll Forward]        
Balance $ 256,320   $ 259,399  
Adjustments to purchase price allocations   $ (2,214)    
Additions through acquisitions 0      
Reductions through divestitures (37)   (865)  
Balance 256,283   256,320  
Accumulated impairment loss       $ 299,300
Domestic        
Goodwill [Roll Forward]        
Balance 114,022   114,839  
Adjustments to purchase price allocations     (817)  
Additions through acquisitions 0      
Reductions through divestitures 0   0  
Balance 114,022   114,022  
Import        
Goodwill [Roll Forward]        
Balance 104,308   106,179  
Adjustments to purchase price allocations     (1,006)  
Additions through acquisitions 0      
Reductions through divestitures (37)   (865)  
Balance 104,271   104,308  
Luxury        
Goodwill [Roll Forward]        
Balance 37,990   38,381  
Adjustments to purchase price allocations     (391)  
Additions through acquisitions 0      
Reductions through divestitures 0   0  
Balance $ 37,990   $ 37,990