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Goodwill and Intangible Assets (Schedule of Goodwill) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 137,333
Reclassification due to segment reorganization	0
Foreign currency translation adjustments	(129)
Goodwill, ending balance	137,204
Institutional Investors
Goodwill [Roll Forward]
Goodwill, beginning balance	61,884
Reclassification due to segment reorganization	0
Foreign currency translation adjustments	(128)
Goodwill, ending balance	61,756
Investment Managers
Goodwill [Roll Forward]
Goodwill, beginning balance	56,990
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
Reclassification due to segment reorganization	1,711
Foreign currency translation adjustments	0
Goodwill, ending balance	$ 20,170

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase (decrease), classified as other, of an asset representing the future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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