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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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