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Goodwill and Franchise Value (Schedule of Goodwill) (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2008
Goodwill [Roll Forward] |  |  |
Balance | $ 256,320 | $ 259,399 |
Adjustments to purchase price allocations | 24,671 | (2,214) |
Reductions through divestitures | (37) | (865) |
Balance | 280,954 | 256,320 |
Accumulated impairment loss |  |  | $ 299,300
Domestic |  |  |
Goodwill [Roll Forward] |  |  |
Balance | 114,022 | 114,839 |
Adjustments to purchase price allocations | 7,726 | (817) |
Reductions through divestitures | 0 | 0 |
Balance | 121,748 | 114,022 |
Import |  |  |
Goodwill [Roll Forward] |  |  |
Balance | 104,308 | 106,179 |
Adjustments to purchase price allocations | 15,674 | (1,006) |
Reductions through divestitures | (37) | (865) |
Balance | 119,945 | 104,308 |
Luxury |  |  |
Goodwill [Roll Forward] |  |  |
Balance | 37,990 | 38,381 |
Adjustments to purchase price allocations | 1,271 | (391) |
Reductions through divestitures | 0 | 0 |
Balance | 39,261 | $ 37,990 |
Baierl Auto Group |  |  |
Goodwill [Roll Forward] |  |  |
Adjustments to purchase price allocations | $ 24,700 |  |

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