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Capital Stock, Repurchases of Common Stock (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Jul. 31, 2018
Repurchases of Common Stock [Abstract] |  |  |  |
Class A common stock repurchased | $ 80,420 | $ 144,334 | $ 825 |
2018 Stock Repurchase Plan [Member] |  |  |  |
Repurchases of Common Stock [Abstract] |  |  |  |
Authorized amount |  |  |  | $ 500,000
Amount available for repurchases | 245,400 |  |  |
Treasury Stock [Member] |  |  |  |
Repurchases of Common Stock [Abstract] |  |  |  |
Class A common stock repurchased | $ 80,420 | $ 144,334 | $ 825 |
Treasury Stock [Member] | 2018 Stock Repurchase Plan [Member] |  |  |  |
Repurchases of Common Stock [Abstract] |  |  |  |
Class A common stock repurchased (in shares) | 1,600,000 | 5,100,000 | 14,000 |
Class A common stock repurchased | $ 80,400 | $ 144,300 | $ 800 |

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