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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

X

- 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.

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