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Note 19 - Certain Segment Financial Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Operating Segments [Member] | Domestic [Member] |  |  |  |
Revenues: |  |  |  |
Revenues |  | $ 3,034,849 | $ 2,566,473 | $ 2,145,478
Segment income*: |  |  |  |
Segment income | [1] | 115,525 | 96,888 | 84,500
Floor plan interest expense: |  |  |  |
Floor plan interest expense |  | 20,970 | 17,852 | 15,223
Operating Segments [Member] | Import [Member] |  |  |  |
Revenues: |  |  |  |
Revenues |  | 3,334,983 | 1,893,034 | 1,225,800
Segment income*: |  |  |  |
Segment income | [1] | 98,371 | 50,870 | 40,264
Floor plan interest expense: |  |  |  |
Floor plan interest expense |  | 15,051 | 9,439 | 6,475
Operating Segments [Member] | Luxury [Member] |  |  |  |
Revenues: |  |  |  |
Revenues |  | 1,490,632 | 926,856 | 629,521
Segment income*: |  |  |  |
Segment income | [1] | 36,391 | 25,448 | 16,133
Floor plan interest expense: |  |  |  |
Floor plan interest expense |  | 9,096 | 5,098 | 3,931
Operating Segments [Member] | Corporate and Other [Member] |  |  |  |
Floor plan interest expense: |  |  |  |
Floor plan interest expense |  | 25,583 | 18,528 | 13,256
Operating Segments [Member] |  |  |  |
Revenues: |  |  |  |
Revenues |  | 7,860,464 | 5,386,363 | 4,000,799
Segment income*: |  |  |  |
Segment income | [1] | 250,287 | 173,206 | 140,897
Floor plan interest expense: |  |  |  |
Floor plan interest expense |  | 45,117 | 32,389 | 25,629
Corporate, Non-Segment [Member] |  |  |  |
Revenues: |  |  |  |
Revenues |  | 3,788 | 3,963 | 4,950
Segment income*: |  |  |  |
Segment income | [1] | 74,514 | 71,195 | 50,283
Revenues |  | 7,864,252 | 5,390,326 | 4,005,749
Segment income | [1] | 262,704 | 210,495 | 165,788
Depreciation and amortization |  | (41,600) | (26,363) | (20,035)
Other interest expense |  | (19,491) | (10,742) | (8,350)
Other (expense) income, net |  | (1,006) | 3,199 | 2,993
Floor plan interest expense: |  |  |  |
Floor plan interest expense |  | $ 19,534 | $ 13,861 | $ 12,373
[1] | Segment income for each of the segments is defined as Income from continuing operations before income taxes, depreciation and amortization, other interest expense and other (expense) income, net.

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- Definition The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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