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Acquisitions (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) business	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)
Business Acquisition [Line Items]
Acquisition of businesses, net of cash acquired	$ 36,214	$ 0
Goodwill	5,078,370		$ 5,070,586
Dealer generated customer accounts and bulk account purchases	$ 159,607	$ 143,688
Series of Individually Immaterial Business Acquisitions
Business Acquisition [Line Items]
Number of businesses acquired | business	2
Acquisition of businesses, net of cash acquired	$ 36,000
Goodwill	12,000
Series of Individually Immaterial Business Acquisitions | Customer Relationships
Business Acquisition [Line Items]
Finite-lived intangible assets acquired	$ 13,394

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The amount of identifiable intangible assets recognized as of the acquisition date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 55
-Paragraph 37
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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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The number of businesses acquired by the entity during the period.

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The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill.

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