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Equity - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Apr. 30, 2021 | Apr. 30, 2020
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Purchase of treasury stock (in shares) | 993,100 |  | 843,416 |  | 2,498,100 | 1,557,667 |  |
Purchase of treasury stock | $ 31,797 | $ 45,030 | $ 18,126 | $ 15,959 | $ 76,800 |  |  |
Class B Shares |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares authorized under share repurchase program (in shares) |  |  |  |  |  |  | 4,000,000.0 | 3,500,000
Purchase of treasury stock (in shares) |  |  |  |  | 2,500,000 |  |  |
Remaining number of shares authorized to be repurchased (in shares) | 3,200,000 |  |  |  | 3,200,000 |  |  |

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