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Capital Stock, Repurchase of Common Stock (Details) - USD ($) $ in Thousands, shares in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Repurchases of Common Stock [Abstract] |  |
Class A common stock repurchased | $ 50,406 | $ 60,886
Amount available for repurchases | $ 275,400 |
Treasury Stock [Member] |  |
Repurchases of Common Stock [Abstract] |  |
Class A common stock repurchased (in shares) | 1.0 | 2.6
Class A common stock repurchased | $ 50,406 | $ 60,886

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