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Note 10 - Certain Segment Financial Information (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Operating Segments [Member] | Domestic [Member] |  |  |
Revenues: |  |  |
Revenues |  | $ 768,902 | $ 690,682
Segment income*: |  |  |
Segment income | [1] | 21,730 | 27,294
Floor plan interest expense: |  |  |
Floor plan interest expense |  | 6,431 | 4,722
Operating Segments [Member] | Import [Member] |  |  |
Revenues: |  |  |
Revenues |  | 865,743 | 760,080
Segment income*: |  |  |
Segment income | [1] | 22,633 | 17,063
Floor plan interest expense: |  |  |
Floor plan interest expense |  | 4,299 | 3,713
Operating Segments [Member] | Luxury [Member] |  |  |
Revenues: |  |  |
Revenues |  | 346,813 | 336,993
Segment income*: |  |  |
Segment income | [1] | 4,235 | 6,645
Floor plan interest expense: |  |  |
Floor plan interest expense |  | 2,657 | 2,062
Operating Segments [Member] |  |  |
Revenues: |  |  |
Revenues |  | 1,981,458 | 1,787,755
Segment income*: |  |  |
Segment income | [1] | 48,598 | 51,002
Floor plan interest expense: |  |  |
Floor plan interest expense |  | 13,387 | 10,497
Corporate, Non-Segment [Member] |  |  |
Revenues: |  |  |
Revenues |  | 1,403 | 1,423
Segment income*: |  |  |
Segment income | [1] | 30,071 | 21,976
Corporate and Other [Member] |  |  |
Floor plan interest expense: |  |  |
Floor plan interest expense |  | (7,478) | (5,848)
Revenues |  | 1,982,861 | 1,789,178
Segment income |  | 60,021 | 58,056
Depreciation and amortization |  | (11,663) | (9,726)
Other interest expense |  | (5,459) | (4,828)
Other expense, net |  | (1,526) | (368)
Floor plan interest expense |  | $ 5,909 | $ 4,649
[1] | Segment income for each of the segments is defined as Income before income taxes, depreciation and amortization, other interest expense and other expense, net.

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