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Segments (Certain Financial Information a Segment Basis) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Segment Reporting Information [Line Items]        
Total revenues $ 2,467,036 $ 2,133,339 $ 4,703,137 $ 4,116,200
Income before income taxes 87,836 77,303 169,099 137,324
Depreciation and amortization (14,031) (12,503) (26,770) (24,166)
Other interest expense, net (7,169) (5,502) (13,840) (10,961)
Other income (expense), net 387 (1,495) 10,232 (3,021)
Floor plan interest expense:        
Floor plan interest expense 9,332 6,209 17,384 12,118
Operating segments        
Segment Reporting Information [Line Items]        
Total revenues 2,469,351 2,132,593 4,704,385 4,114,051
Income before income taxes 70,410 68,409 122,737 120,384
Floor plan interest expense:        
Floor plan interest expense 18,892 13,276 35,795 26,664
Operating segments | Domestic        
Segment Reporting Information [Line Items]        
Total revenues 954,949 830,410 1,854,707 1,602,312
Income before income taxes 27,857 28,999 53,299 52,129
Floor plan interest expense:        
Floor plan interest expense 8,716 6,233 16,670 12,729
Operating segments | Import        
Segment Reporting Information [Line Items]        
Total revenues 1,101,314 930,317 2,072,787 1,793,060
Income before income taxes 32,465 29,680 54,637 53,943
Floor plan interest expense:        
Floor plan interest expense 6,793 4,393 12,666 8,627
Operating segments | Luxury        
Segment Reporting Information [Line Items]        
Total revenues 413,088 371,866 776,891 718,679
Income before income taxes 10,088 9,730 14,801 14,312
Floor plan interest expense:        
Floor plan interest expense 3,383 2,650 6,459 5,308
Corporate and other        
Segment Reporting Information [Line Items]        
Total revenues (2,315) 746 (1,248) 2,149
Income before income taxes 38,239 28,394 76,740 55,088
Floor plan interest expense:        
Floor plan interest expense (9,560) (7,067) (18,411) (14,546)
Segment reconciling items        
Segment Reporting Information [Line Items]        
Depreciation and amortization (14,031) (12,503) (26,770) (24,166)
Other interest expense, net (7,169) (5,502) (13,840) (10,961)
Other income (expense), net $ 387 $ (1,495) $ 10,232 $ (3,021)