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Investments - Gains and Losses Recognized in Gain (Loss) on Securities, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Gain (Loss) on Securities [Line Items]
Gain (Loss) on Securities, net	$ 18,067	$ 4,966	$ (4,357)
Investments—Consolidated Investment Companies
Gain (Loss) on Securities [Line Items]
Unrealized Gains (Losses)	13,862	4,759	(3,142)
Net Realized Gains (Losses)	(1,352)	(1,243)	(374)
Gain (Loss) on Securities, net	12,510	3,516	(3,516)
Investments—Affiliates and Other
Gain (Loss) on Securities [Line Items]
Unrealized Gains (Losses)	5,541	2,156	(1,180)
Net Realized Gains (Losses)	16	(706)	339
Gain (Loss) on Securities, net	$ 5,557	$ 1,450	$ (841)

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=121586364&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=120395209&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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