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Capital Stock, Repurchase of Common Stock (Details) - USD ($) $ in Thousands, shares in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Repurchases of Common Stock [Abstract] |  |  |  |
Class A common stock repurchased | $ 10,004 | $ 10,004 | $ 20,010 | $ 60,410
Amount available for repurchases | $ 225,400 |  | $ 225,400 |
Treasury Stock [Member] |  |  |  |
Repurchases of Common Stock [Abstract] |  |  |  |
Class A common stock repurchased (in shares) | 0.2 | 0.2 | 0.4 | 1.2
Class A common stock repurchased | $ 10,004 | $ 10,004 | $ 20,010 | $ 60,410

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