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Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Apr. 30, 2020 | Mar. 31, 2020 | Oct. 31, 2016
Class of Stock [Line Items] |  |  |  |  |  |  |
Dividends paid |  | $ 207,765 | $ 109,147 | $ 106,943 |  |  |
Special dividends paid | $ 99,300 |  |  |  |  |  |
Special dividend paid (usd per share) | $ 1.00 |  |  |  |  |  |
Amount paid for repurchase of common stock |  | 67,905 | $ 15,740 | $ 29,100 |  |  |
Accrued in other current liabilities | $ 1,100 | $ 1,100 |  |  |  |  |
Class B |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Number of shares authorized under share repurchase program (in shares) |  |  |  |  | 3,500,000 | 500,000 | 4,000,000
Repurchased shares (in shares) |  | 2,900,000 |  |  |  |  |
Amount paid for repurchase of common stock |  | $ 67,900 |  |  |  |  |
Remaining number of shares authorized to be repurchased (in shares) | 1,700,000 | 1,700,000 |  |  |  |  |

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