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Intangible Franchise Rights and Goodwill Goodwill (Details) | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance | $ 876,763,000 | $ 854,915,000 |
Goodwill, Acquired During Period | 32,002,000 | 33,499,000 |
Goodwill, Purchase Accounting Adjustments |  | 1,052,000 |
Goodwill, Written off Related to Sale of Business Unit | (933,000) | (4,059,000) |
Goodwill, Impairment Loss |  |  | $ 55,400,000
Goodwill, Foreign Currency Translation Gain (Loss) | 5,202,000 | (8,644,000) |
Goodwill, Ending Balance | $ 913,034,000 | 876,763,000 | 854,915,000
Goodwill, Impaired, Accumulated Impairment Loss |  | 97,800,000 |
U.S. |  |  |
Goodwill [Line Items] |  |  |
Number Of Dealerships Acquired | 3 |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance | $ 805,935,000 | 809,775,000 |
Goodwill, Acquired During Period | 29,332,000 | 0 |
Goodwill, Purchase Accounting Adjustments |  | 28,000 |
Goodwill, Written off Related to Sale of Business Unit | 0 | (3,868,000) |
Goodwill, Foreign Currency Translation Gain (Loss) | 0 | 0 |
Goodwill, Ending Balance | $ 835,267,000 | $ 805,935,000 | 809,775,000
U.K. |  |  |
Goodwill [Line Items] |  |  |
Number Of Dealerships Acquired | 12 | 12 |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance | $ 57,054,000 | $ 35,320,000 |
Goodwill, Acquired During Period | 2,575,000 | 31,644,000 |
Goodwill, Purchase Accounting Adjustments |  | 1,024,000 |
Goodwill, Written off Related to Sale of Business Unit | 0 | 0 |
Goodwill, Foreign Currency Translation Gain (Loss) | 5,405,000 | (10,934,000) |
Goodwill, Ending Balance | 65,034,000 | $ 57,054,000 | 35,320,000
Brazil |  |  |
Goodwill [Line Items] |  |  |
Number Of Dealerships Acquired |  | 1 |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance | 13,774,000 | $ 9,820,000 |
Goodwill, Acquired During Period | 95,000 | 1,855,000 |
Goodwill, Purchase Accounting Adjustments |  | 0 |
Goodwill, Written off Related to Sale of Business Unit | (933,000) | (191,000) |
Goodwill, Foreign Currency Translation Gain (Loss) | (203,000) | 2,290,000 |
Goodwill, Ending Balance | $ 12,733,000 | $ 13,774,000 | $ 9,820,000

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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=64834752&loc=SL49117168-202975 + Details
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