Capital Stock, Repurchases of Common Stock (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Jul. 31, 2018
Repurchases of Common Stock [Abstract]
Class A common stock repurchased		$ 13,011	$ 70,045
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
Treasury Stock [Member] | 2018 Stock Repurchase Plan [Member]
Repurchases of Common Stock [Abstract]
Class A common stock repurchased (in shares)	0	600,000	1,700,000
Class A common stock repurchased		$ 13,000	$ 70,000