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Segments (Schedule of Certain Financial Information on a Segment Basis) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | $ 3,091,952 | $ 2,680,342 | $ 8,848,168 | $ 7,383,479
Income before income taxes | 108,987 | 86,543 | 259,536 | 255,642
Depreciation and amortization |  |  | (55,324) | (41,598)
Other interest expense | (15,010) | (9,905) | (40,645) | (23,745)
Other income, net | 2,389 | 1,125 | 5,422 | 11,357
Operating segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 3,087,102 | 2,681,783 | 8,839,974 | 7,386,169
Income before income taxes | 74,358 | 75,610 | 200,610 | 198,347
Operating segments | Domestic |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 1,097,854 | 1,008,310 | 3,163,539 | 2,863,018
Income before income taxes | 25,304 | 31,141 | 79,466 | 84,440
Operating segments | Import |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 1,336,361 | 1,209,955 | 3,829,524 | 3,276,667
Income before income taxes | 37,369 | 36,954 | 90,634 | 91,365
Operating segments | Luxury |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 652,887 | 463,518 | 1,846,911 | 1,246,484
Income before income taxes | 11,685 | 7,515 | 30,510 | 22,542
Corporate and other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 4,850 | (1,441) | 8,194 | (2,690)
Income before income taxes | 66,899 | 34,541 | 149,473 | 111,281
Segment reconciling items |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | (19,649) | (14,828) | (55,324) | (41,598)
Other interest expense | (15,010) | (9,905) | (40,645) | (23,745)
Other income, net | 2,389 | 1,125 | 5,422 | 11,357
New vehicle |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 1,732,950 | 1,553,511 | 4,914,478 | 4,147,870
New vehicle | Operating segments | Domestic |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 600,054 | 567,423 | 1,711,179 | 1,581,329
New vehicle | Operating segments | Import |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 787,803 | 737,931 | 2,227,393 | 1,933,217
New vehicle | Operating segments | Luxury |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 347,568 | 252,861 | 988,002 | 649,566
Used vehicle retail |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 805,928 | 679,180 | 2,325,600 | 1,915,038
Used vehicle retail | Operating segments | Domestic |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 288,238 | 260,622 | 836,473 | 756,834
Used vehicle retail | Operating segments | Import |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 334,614 | 289,723 | 977,931 | 806,510
Used vehicle retail | Operating segments | Luxury |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 182,479 | 128,355 | 510,323 | 350,992
Used vehicle wholesale |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 91,956 | 65,739 | 253,246 | 206,754
Used vehicle wholesale | Operating segments | Domestic |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 36,983 | 27,986 | 104,502 | 90,972
Used vehicle wholesale | Operating segments | Import |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 35,162 | 24,337 | 94,340 | 78,456
Used vehicle wholesale | Operating segments | Luxury |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 19,896 | 13,418 | 54,359 | 37,114
Finance and insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 121,062 | 101,044 | 342,059 | 282,672
Finance and insurance | Operating segments | Domestic |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 42,541 | 38,408 | 125,626 | 111,970
Finance and insurance | Operating segments | Import |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 60,494 | 51,564 | 167,057 | 137,419
Finance and insurance | Operating segments | Luxury |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 16,421 | 10,816 | 44,606 | 28,335
Service, body and parts |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 311,327 | 265,683 | 908,431 | 744,262
Service, body and parts | Operating segments | Domestic |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 114,756 | 103,070 | 335,370 | 292,987
Service, body and parts | Operating segments | Import |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 114,776 | 104,106 | 340,816 | 289,733
Service, body and parts | Operating segments | Luxury |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 76,906 | 56,240 | 218,582 | 154,598
Fleet and other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 28,729 | 15,185 | 104,354 | 86,883
Fleet and other | Operating segments | Domestic |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 15,282 | 10,801 | 50,389 | 28,926
Fleet and other | Operating segments | Import |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 3,512 | 2,294 | 21,987 | 31,332
Fleet and other | Operating segments | Luxury |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | $ 9,617 | $ 1,828 | $ 31,039 | $ 25,879

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