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Investments - Gains and Losses Recognized in Gain (Loss) on Securities, Net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
(Loss) Gain on Securities [Line Items]
Gain (Loss) on Securities, net	$ (644)	$ 5,852	$ 6,980	$ 3,840
Investments—Consolidated Investment Companies
(Loss) Gain on Securities [Line Items]
Net Unrealized Gains (Losses)	(391)	4,451	(1,197)	3,987
Net Realized Gains (Losses)	184	(47)	1,786	(1,151)
Gain (Loss) on Securities, net	(207)	4,404	589	2,836
Investments—Affiliates and Other
(Loss) Gain on Securities [Line Items]
Net Unrealized Gains (Losses)	(2,077)	1,816	1,170	1,410
Net Realized Gains (Losses)	1,640	(368)	5,221	(406)
Gain (Loss) on Securities, net	$ (437)	$ 1,448	$ 6,391	$ 1,004

X

- Definition

The net realized gain (loss) on investments sold during the period, not including gains (losses) on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, which, for cash flow reporting, is a component of proceeds from investing activities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

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- Definition

Amount of unrealized and realized gain (loss) on investment in marketable security, including other-than-temporary impairment (OTTI).

+ References

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Amount of unrealized gain (loss) on investment in marketable security.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(7)(c))
-URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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