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Capital Stock, Repurchase of Common Stock (Details) - USD ($) $ in Thousands, shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Repurchases of Common Stock [Abstract]
Class A common stock repurchased	$ 10,005	$ 19,994	$ 70,415	$ 127,361
Amount available for repurchases	$ 255,400		$ 255,400
Treasury Stock [Member]
Repurchases of Common Stock [Abstract]
Class A common stock repurchased (in shares)	0.2	0.4	1.4	4.8
Class A common stock repurchased	$ 10,005	$ 19,994	$ 70,415	$ 127,361

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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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