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Segments (Reconciliation of Assets from Segment to Consolidated) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Total assets | $ 4,371,593 | $ 3,844,150
Operating segments | Domestic |  |
Segment Reporting Information [Line Items] |  |
Total assets | 1,256,960 | 1,225,387
Operating segments | Import |  |
Segment Reporting Information [Line Items] |  |
Total assets | 1,067,466 | 959,355
Operating segments | Luxury |  |
Segment Reporting Information [Line Items] |  |
Total assets | 590,515 | 511,779
Corporate and other |  |
Segment Reporting Information [Line Items] |  |
Total assets | $ 1,456,652 | $ 1,147,629

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