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Revenues - Narrative (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Stockholders’ equity | $ 1,449,600 | $ 1,255,700 | $ 1,095,700 |  | $ 1,124,300
Charge back reserve | $ 47,100 | $ 49,700 |  |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Stockholders’ equity |  |  | $ (6,100) |  | $ 11,400
Adjustment due to Topic 606 | Maintenance and Repair Services | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Stockholders’ equity |  |  |  | $ 4,800 |
Adjustment due to Topic 606 | Vehicle Financing, Sale of Service and Insurance Contracts | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Stockholders’ equity |  |  |  | $ 6,600 |

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