Income and Partnership Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Deferred tax assets:
Compensation	$ 15,615	$ 14,817
Accrued expenses	4,704	4,135
Foreign tax credits	17,991	11,467
Tax attribute carryforwards	13,570	13,823
Foreign currency translation	3,776	5,313
Deferred revenue	1,557	1,911
Lease liability	16,856	19,037
Deferred tax assets	74,069	70,503
Valuation allowance	(32,143)	(24,228)
Net deferred tax assets	41,926	46,275
Deferred tax liabilities:
Property	(69,143)	(76,871)
Intangibles	(20,495)	(20,170)
Right-of-use asset	(15,691)	(18,646)
Deferred tax liabilities	(105,329)	(115,687)
Net deferred tax liability	$ (63,403)	$ (69,412)