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Segments (Reconciliation of Assets from Segment to Consolidated) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Total Assets | $ 5,164,162 | $ 4,683,066
Operating segments | Domestic |  |
Segment Reporting Information [Line Items] |  |
Total Assets | 1,380,823 | 1,224,276
Operating segments | Import |  |
Segment Reporting Information [Line Items] |  |
Total Assets | 1,244,218 | 1,032,665
Operating segments | Luxury |  |
Segment Reporting Information [Line Items] |  |
Total Assets | 690,774 | 604,023
Corporate and other |  |
Segment Reporting Information [Line Items] |  |
Total Assets | $ 1,848,347 | $ 1,822,102

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