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Equity - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Apr. 30, 2021
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Purchase of treasury stock (in shares) | 593,619 |  |  | 866,900 |  |  | 3,091,719 | 2,424,567 |
Purchase of treasury stock | $ 17,703 | $ 31,797 | $ 45,030 | $ 20,023 | $ 18,126 | $ 15,959 | $ 94,500 |  |
Other Current Liabilities |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Purchase of treasury stock |  |  |  |  |  |  | $ 3,200 |  |
Class B Shares |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Number of shares authorized under share repurchase program (in shares) |  |  |  |  |  |  |  |  | 4,000,000
Purchase of treasury stock (in shares) |  |  |  |  |  |  | 3,100,000 |  |
Remaining number of shares authorized to be repurchased (in shares) | 2,600,000 |  |  |  |  |  | 2,600,000 |  |

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