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Goodwill and Franchise Value (Schedule of Goodwill) (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2008
Goodwill [Roll Forward] |  |  |
Balance | $ 256,320 | $ 259,399 |
Adjustments to purchase price allocations | 102,797 | (2,214) |
Reductions through divestitures | (2,149) | (865) |
Balance | 356,968 | 256,320 |
Accumulated impairment loss |  |  | $ 299,300
Domestic |  |  |
Goodwill [Roll Forward] |  |  |
Balance | 114,022 | 114,839 |
Adjustments to purchase price allocations | 29,933 | (817) |
Reductions through divestitures | (951) | 0 |
Balance | 143,004 | 114,022 |
Import |  |  |
Goodwill [Roll Forward] |  |  |
Balance | 104,308 | 106,179 |
Adjustments to purchase price allocations | 51,790 | (1,006) |
Reductions through divestitures | (1,198) | (865) |
Balance | 154,900 | 104,308 |
Luxury |  |  |
Goodwill [Roll Forward] |  |  |
Balance | 37,990 | 38,381 |
Adjustments to purchase price allocations | 21,074 | (391) |
Reductions through divestitures | 0 | 0 |
Balance | $ 59,064 | $ 37,990 |

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