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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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Repurchases of Common Stock [Abstract]
Class A common stock repurchased	$ 10,004	$ 46,481	$ 60,410	$ 107,367
Amount available for repurchases	$ 265,400		$ 265,400
Treasury Stock [Member]
Repurchases of Common Stock [Abstract]
Class A common stock repurchased (in shares)	0.2	1.7	1.2	4.4
Class A common stock repurchased	$ 10,004	$ 46,481	$ 60,410	$ 107,367

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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