Capital Stock, Repurchases of Common Stock (Details) - USD ($) $ in Thousands, shares in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Jul. 31, 2018
Repurchases of Common Stock [Abstract]
Class A common stock repurchased	$ 13,011	$ 70,045	$ 80,420
2018 Stock Repurchase Plan [Member]
Repurchases of Common Stock [Abstract]
Authorized amount				$ 500,000
Amount available for repurchases	162,400
Treasury Stock [Member]
Repurchases of Common Stock [Abstract]
Class A common stock repurchased	$ 13,011	$ 70,045	$ 80,420
Treasury Stock [Member] | 2018 Stock Repurchase Plan [Member]
Repurchases of Common Stock [Abstract]
Class A common stock repurchased (in shares)	0.6	1.7	1.6
Class A common stock repurchased	$ 13,000	$ 70,000	$ 80,400