The discount rate used in determining goodwill impairment.

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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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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Amount before 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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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Goodwill and Intangible Assets - Change in Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill
Balance (excluding impairment charges)				$ 354,866
Accumulated impairment charges				(201,791)
Balance		$ 348,387	$ 153,075
Acquisitions		50,776	195,312
Impairment charge		(40,046)
Balance	$ 359,117	359,117	348,387
Retail
Goodwill
Impairment charge	(40,000)
Balance	$ 0	$ 0
Valuation information
Growth rate to calculate terminal value	2.50%	2.50%
Discount rate	10.50%	10.50%
Retail \| Income Approach
Valuation information
Weighted approach of the full valuation (as a percent)	70.00%	70.00%
Retail \| Market Approach
Valuation information
Weighted approach of the full valuation (as a percent)	30.00%	30.00%
Dealership
Goodwill
Impairment charge		$ 0
Valuation information
Growth rate to calculate terminal value	2.30%	2.30%
Discount rate	8.70%	8.70%
Dealership \| Income Approach
Valuation information
Weighted approach of the full valuation (as a percent)	70.00%	70.00%
Dealership \| Market Approach
Valuation information
Weighted approach of the full valuation (as a percent)	30.00%	30.00%
GSS
Goodwill
Balance	$ 50,300	$ 50,300
Consumer services and plans
Goodwill
Balance (excluding impairment charges)				96,828
Accumulated impairment charges				(46,884)
Balance		49,944	49,944
Acquisitions		376
Balance	50,320	50,320	49,944
Dealership
Goodwill
Balance (excluding impairment charges)				246,929
Accumulated impairment charges				(143,798)
Balance		261,976	103,131
Acquisitions		46,821	158,845
Balance	$ 308,797	308,797	261,976
Retail
Goodwill
Balance (excluding impairment charges)				11,109
Accumulated impairment charges				$ (11,109)
Balance		36,467
Acquisitions		3,579	36,467
Impairment charge		$ (40,046)
Balance			$ 36,467