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Goodwill and Franchise Value (Schedule of Goodwill) (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 | Dec. 31, 2016
Goodwill [Roll Forward] |  |
Balance | $ 259,399 | $ 213,220
Additions through acquisitions | 0 | 47,397
Reductions through divestitures |  | (1,218)
Balance | 259,399 | 259,399
Domestic |  |
Goodwill [Roll Forward] |  |
Balance | 114,839 | 97,903
Additions through acquisitions | 0 | 18,154
Reductions through divestitures |  | (1,218)
Balance | 114,839 | 114,839
Import |  |
Goodwill [Roll Forward] |  |
Balance | 106,179 | 84,384
Additions through acquisitions | 0 | 21,795
Reductions through divestitures |  | 0
Balance | 106,179 | 106,179
Luxury |  |
Goodwill [Roll Forward] |  |
Balance | 38,381 | 30,933
Additions through acquisitions | 0 | 7,448
Reductions through divestitures |  | 0
Balance | $ 38,381 | $ 38,381

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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