Goodwill and Intangible Assets (Schedule of Goodwill) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2024 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 137,333
Measurement period adjustments	25
Reclassification due to segment reorganization	0
Foreign currency translation adjustments	(104)
Goodwill, ending balance	137,254
Institutional Investors
Goodwill [Roll Forward]
Goodwill, beginning balance	61,884
Measurement period adjustments	25
Reclassification due to segment reorganization	0
Foreign currency translation adjustments	(103)
Goodwill, ending balance	61,806
Investment Managers
Goodwill [Roll Forward]
Goodwill, beginning balance	56,990
Measurement period adjustments	0
Reclassification due to segment reorganization	(1,711)
Foreign currency translation adjustments	(1)
Goodwill, ending balance	55,278
Investments In New Businesses
Goodwill [Roll Forward]
Goodwill, beginning balance	18,459
Measurement period adjustments	0
Reclassification due to segment reorganization	1,711
Foreign currency translation adjustments	0
Goodwill, ending balance	$ 20,170