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Segments (Reconciliation of Assets from Segment to Consolidated) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Total Assets | $ 5,086,983 | $ 4,683,066
Operating segments | Domestic |  |
Segment Reporting Information [Line Items] |  |
Total Assets | 1,406,219 | 1,338,232
Operating segments | Import |  |
Segment Reporting Information [Line Items] |  |
Total Assets | 1,231,503 | 1,137,934
Operating segments | Luxury |  |
Segment Reporting Information [Line Items] |  |
Total Assets | 696,761 | 641,118
Corporate and other |  |
Segment Reporting Information [Line Items] |  |
Total Assets | $ 1,752,500 | $ 1,565,782

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