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Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Apr. 30, 2021 | Apr. 30, 2020 | Mar. 31, 2020 | Oct. 31, 2016
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Dividends paid |  | $ 105,764 | $ 207,765 | $ 109,147 |  |  |  |
Special dividends paid | $ 99,300 |  |  |  |  |  |  |
Special dividend paid (usd per share) | $ 1.00 |  |  |  |  |  |  |
Amount paid for repurchase of common stock |  | $ 239,728 | $ 67,905 | $ 15,740 |  |  |  |
Treasury Stock |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Purchase of treasury stock (in shares) |  | 7,145,838 | 2,940,267 | 614,077 |  |  |  |
Amount paid for repurchase of common stock |  | $ 239,728 | $ 67,905 | $ 15,740 |  |  |  |
Other Current Liabilities |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Accrued in other current liabilities |  | $ 12,500 |  |  |  |  |  |
Class B |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares authorized under share repurchase program (in shares) |  | 7,500,000 |  |  | 4,000,000 | 3,500,000 | 500,000 | 4,000,000
Remaining number of shares authorized to be repurchased (in shares) |  | 6,100,000 |  |  |  |  |  |
Class B | Treasury Stock |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Purchase of treasury stock (in shares) |  | 7,100,000 |  |  |  |  |  |

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