Income Taxes - Earnings Before Income Taxes and Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Earnings before income taxes:
United States	$ 714,732	$ 689,278	$ 1,007,847
Foreign	102,938	125,818	208,615
Operating income	817,670	815,096	1,216,462
Income tax expense:
Partnership UBT	7,838	5,996	6,951
Corporate subsidiaries:
Federal	2,855	1,457	750
State and local	914	931	956
Foreign	35,906	34,327	58,080
Current tax expense	47,513	42,711	66,737
Deferred tax	(18,462)	(3,072)	(4,009)
Income tax expense	$ 29,051	$ 39,639	$ 62,728