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Equity - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Apr. 30, 2020 | Oct. 31, 2016
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Purchase of treasury stock (in shares) | 843,416 |  | 52,600 |  | 1,557,667 | 113,433 |  |
Purchase of treasury stock | $ 18,126 | $ 15,959 | $ 709 | $ 1,485 |  |  |  |
Accrued in other current liabilities | (1,200) |  |  |  | $ (1,200) |  |  |
Treasury Stock |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Purchase of treasury stock | $ 18,126 | $ 15,959 | $ 709 | $ 1,485 | $ 34,100 |  |  |
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) |  |  |  |  | 1,600,000 |  |  |
Remaining number of shares authorized to be repurchased (in shares) | 3,000,000.0 |  |  |  | 3,000,000.0 |  |  |

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