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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

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