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Segments (Schedule of Certain Financial Information on a Segment Basis) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Segment Reporting Information [Line Items]    
Total revenues $ 2,659,679 $ 2,236,101
Income before income taxes 69,797 81,263
Depreciation and amortization (16,854) (12,739)
Other interest expense, net (11,806) (6,671)
Other income, net 1,374 9,845
Floor plan interest expense:    
Floor plan interest expense 13,534 8,052
Operating segments    
Segment Reporting Information [Line Items]    
Total revenues 2,657,544 2,235,034
Income before income taxes 55,524 52,327
Floor plan interest expense:    
Floor plan interest expense 26,174 16,903
Operating segments | Domestic    
Segment Reporting Information [Line Items]    
Total revenues 970,616 899,759
Income before income taxes 25,618 25,442
Floor plan interest expense:    
Floor plan interest expense 11,612 7,954
Operating segments | Import    
Segment Reporting Information [Line Items]    
Total revenues 1,170,433 971,472
Income before income taxes 23,020 22,172
Floor plan interest expense:    
Floor plan interest expense 9,429 5,873
Operating segments | Luxury    
Segment Reporting Information [Line Items]    
Total revenues 516,495 363,803
Income before income taxes 6,886 4,713
Floor plan interest expense:    
Floor plan interest expense 5,133 3,076
Corporate and other    
Segment Reporting Information [Line Items]    
Total revenues 2,135 1,067
Income before income taxes 41,559 38,501
Floor plan interest expense:    
Floor plan interest expense (12,640) (8,851)
Segment reconciling items    
Segment Reporting Information [Line Items]    
Depreciation and amortization (16,854) (12,739)
Other interest expense, net (11,806) (6,671)
Other income, net 1,374 9,845
New vehicle    
Segment Reporting Information [Line Items]    
Total revenues 1,454,725 1,210,304
New vehicle | Operating segments | Domestic    
Segment Reporting Information [Line Items]    
Total revenues 513,529 485,257
New vehicle | Operating segments | Import    
Segment Reporting Information [Line Items]    
Total revenues 667,602 551,881
New vehicle | Operating segments | Luxury    
Segment Reporting Information [Line Items]    
Total revenues 278,521 176,317
Used vehicle retail    
Segment Reporting Information [Line Items]    
Total revenues 715,574 602,223
Used vehicle retail | Operating segments | Domestic    
Segment Reporting Information [Line Items]    
Total revenues 264,827 244,997
Used vehicle retail | Operating segments | Import    
Segment Reporting Information [Line Items]    
Total revenues 307,689 247,276
Used vehicle retail | Operating segments | Luxury    
Segment Reporting Information [Line Items]    
Total revenues 142,904 110,606
Used vehicle wholesale    
Segment Reporting Information [Line Items]    
Total revenues 75,955 71,503
Used vehicle wholesale | Operating segments | Domestic    
Segment Reporting Information [Line Items]    
Total revenues 33,607 32,287
Used vehicle wholesale | Operating segments | Import    
Segment Reporting Information [Line Items]    
Total revenues 28,196 26,836
Used vehicle wholesale | Operating segments | Luxury    
Segment Reporting Information [Line Items]    
Total revenues 14,199 12,223
Finance and insurance    
Segment Reporting Information [Line Items]    
Total revenues 106,505 86,777
Finance and insurance | Operating segments | Domestic    
Segment Reporting Information [Line Items]    
Total revenues 40,001 36,209
Finance and insurance | Operating segments | Import    
Segment Reporting Information [Line Items]    
Total revenues 51,696 40,573
Finance and insurance | Operating segments | Luxury    
Segment Reporting Information [Line Items]    
Total revenues 12,251 7,995
Service, body and parts    
Segment Reporting Information [Line Items]    
Total revenues 285,697 232,574
Service, body and parts | Operating segments | Domestic    
Segment Reporting Information [Line Items]    
Total revenues 107,142 93,402
Service, body and parts | Operating segments | Import    
Segment Reporting Information [Line Items]    
Total revenues 109,655 88,663
Service, body and parts | Operating segments | Luxury    
Segment Reporting Information [Line Items]    
Total revenues 64,793 48,032
Fleet and other    
Segment Reporting Information [Line Items]    
Total revenues 21,223 32,720
Fleet and other | Operating segments | Domestic    
Segment Reporting Information [Line Items]    
Total revenues 11,510 7,607
Fleet and other | Operating segments | Import    
Segment Reporting Information [Line Items]    
Total revenues 5,595 16,243
Fleet and other | Operating segments | Luxury    
Segment Reporting Information [Line Items]    
Total revenues $ 3,827 $ 8,630