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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)

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