Goodwill and Intangible Assets - Change in Goodwill (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017
Goodwill
Balance	$ 348,387
Acquisitions	40,700
Balance	389,087
Impairment of goodwill	0	$ 0
Consumer Services and Plans
Goodwill
Balance	49,944
Acquisitions	376
Balance	50,320
Retail
Goodwill
Balance	36,467
Acquisitions	3,579
Balance	40,046
Dealership
Goodwill
Balance	261,976
Acquisitions	36,745
Balance	$ 298,721

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 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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