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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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- 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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