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Segments (Schedule of Certain Financial Information on a Segment Basis) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | $ 3,096,537 | $ 2,467,036 | $ 5,756,216 | $ 4,703,137
Income before income taxes | 80,752 | 87,836 | 150,549 | 169,099
Depreciation and amortization |  |  | (35,675) | (26,770)
Other interest expense, net | (13,829) | (7,169) | (25,635) | (13,840)
Other income, net | 1,659 | 387 | 3,033 | 10,232
Operating segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 3,095,328 | 2,469,351 | 5,752,873 | 4,704,385
Income before income taxes | 70,728 | 70,410 | 126,254 | 122,737
Operating segments | Domestic |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 1,095,068 | 954,949 | 2,065,685 | 1,854,707
Income before income taxes | 28,545 | 27,857 | 54,163 | 53,299
Operating segments | Import |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 1,322,730 | 1,095,239 | 2,493,163 | 2,066,711
Income before income taxes | 30,244 | 32,238 | 53,265 | 54,411
Operating segments | Luxury |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 677,530 | 419,163 | 1,194,025 | 782,967
Income before income taxes | 11,939 | 10,315 | 18,826 | 15,027
Corporate and other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 1,209 | (2,315) | 3,343 | (1,248)
Income before income taxes | 41,015 | 38,239 | 82,572 | 76,740
Segment reconciling items |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | (18,821) | (14,031) | (35,675) | (26,770)
Other interest expense, net | (13,829) | (7,169) | (25,635) | (13,840)
Other income, net | 1,659 | 387 | 3,033 | 10,232
New vehicle |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 1,726,803 | 1,384,055 | 3,181,528 | 2,594,359
New vehicle | Operating segments | Domestic |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 597,596 | 528,649 | 1,111,125 | 1,013,906
New vehicle | Operating segments | Import |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 771,987 | 643,404 | 1,439,590 | 1,195,286
New vehicle | Operating segments | Luxury |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 361,913 | 220,388 | 640,434 | 396,705
Used vehicle retail |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 804,098 | 633,635 | 1,519,672 | 1,235,858
Used vehicle retail | Operating segments | Domestic |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 283,408 | 251,214 | 548,235 | 496,212
Used vehicle retail | Operating segments | Import |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 335,629 | 269,512 | 643,317 | 516,788
Used vehicle retail | Operating segments | Luxury |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 184,941 | 112,032 | 327,845 | 222,637
Used vehicle wholesale |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 85,335 | 69,512 | 161,290 | 141,015
Used vehicle wholesale | Operating segments | Domestic |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 33,913 | 30,700 | 67,519 | 62,986
Used vehicle wholesale | Operating segments | Import |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 30,983 | 27,283 | 59,178 | 54,120
Used vehicle wholesale | Operating segments | Luxury |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 20,263 | 11,473 | 34,463 | 23,696
Finance and insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 114,492 | 94,851 | 220,997 | 181,628
Finance and insurance | Operating segments | Domestic |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 43,083 | 37,354 | 83,083 | 73,562
Finance and insurance | Operating segments | Import |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 54,866 | 45,282 | 106,562 | 85,855
Finance and insurance | Operating segments | Luxury |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 15,934 | 9,525 | 28,185 | 17,519
Service, body and parts |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 311,407 | 246,005 | 597,104 | 478,579
Service, body and parts | Operating segments | Domestic |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 113,472 | 96,515 | 220,614 | 189,917
Service, body and parts | Operating segments | Import |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 116,386 | 96,964 | 226,041 | 185,626
Service, body and parts | Operating segments | Luxury |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 76,883 | 50,326 | 141,676 | 98,358
Fleet and other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 54,402 | 38,978 | 75,625 | 71,698
Fleet and other | Operating segments | Domestic |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 23,596 | 10,517 | 35,109 | 18,124
Fleet and other | Operating segments | Import |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 12,879 | 12,794 | 18,475 | 29,036
Fleet and other | Operating segments | Luxury |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | $ 17,596 | $ 15,419 | $ 21,422 | $ 24,052

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