Income Taxes - Principal Reasons for the Difference Between the Effective Tax Rate and UBT Statutory Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Effective Income Tax Rate Reconciliation, Amount [Abstract]
UBT statutory rate	$ 32,707	$ 32,604	$ 48,659
Corporate subsidiaries' federal, state, and local	4,538	1,460	1,322
Foreign subsidiaries taxed at different rates	36,788	32,664	43,019
FIN 48 reserve (release)	(2,838)	0	0
UBT business allocation percentage rate change	(1,049)	(98)	23
Deferred tax and payable write-offs	1,750	1,089	1,003
Foreign outside basis difference	3,414	(1,535)	1,492
Valuation allowance reserve (release)	(22,447)	0	0
Effect of ASC 740 adjustments, miscellaneous taxes, and other	3,553	5,366	1,799
Tax Credits	(1,604)	(5,275)	0
Income not taxable resulting from use of UBT business apportionment factors and effect of compensation charge	(25,761)	(26,636)	(34,589)
Income tax expense	$ 29,051	$ 39,639	$ 62,728
Effective Income Tax Rate Reconciliation, Percent [Abstract]
UBT statutory rate,percent	4.00%	4.00%	4.00%
Corporate subsidiaries' federal, state, and local, percent	0.60%	0.20%	0.20%
Foreign subsidiaries taxed at different rates, percent	4.50%	4.00%	3.50%
FIN 48 release, percent	(0.30%)	0.00%	0.00%
UBT business allocation percentage rate change, percent	(0.10%)	0.00%	0.00%
Deferred tax and payable write-offs, percent	0.20%	0.10%	0.10%
Foreign outside basis difference, percent	0.40%	(0.20%)	0.10%
Valuation allowance reserve (release), percent	(2.70%)	0.00%	0.00%
Effect of ASC 740 adjustments, miscellaneous taxes, and other, percent	0.40%	0.70%	0.10%
Tax credit, percent	(0.20%)	(0.60%)	0.00%
Income not taxable resulting from use of UBT business apportionment factors and effect of compensation charge, percent	(3.20%)	(3.30%)	(2.80%)
Effective tax rate, percent	3.60%	4.90%	5.20%