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Equity - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Apr. 30, 2020 | Oct. 31, 2016
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase of treasury stock (in shares) | 866,900 |  |  | 79,592 |  |  | 2,424,567 | 193,025 |  |
Purchase of treasury stock | $ 20,023 | $ 18,126 | $ 15,959 | $ 1,860 | $ 709 | $ 1,485 | $ 54,100 |  |  |
Accrued in other current liabilities | $ 1,000 |  |  |  |  |  | $ 1,000 |  |  |
Class B Shares |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares authorized under share repurchase program (in shares) |  |  | 500,000 |  |  |  |  |  | 3,500,000 | 4,000,000
Purchase of treasury stock (in shares) |  |  |  |  |  |  | 2,400,000 |  |  |
Remaining number of shares authorized to be repurchased (in shares) | 2,200,000 |  |  |  |  |  | 2,200,000 |  |  |

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