The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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The cash inflow from sales of all investments, including securities and other assets, having ready marketability and intended by management to be liquidated, if necessary, beyond the current operating cycle.

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The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

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Investment Securities (Narrative) (Details) - USD ($)			1 Months Ended	12 Months Ended
Investment Securities (Narrative) (Details) - USD ($)	Feb. 14, 2020	Oct. 09, 2019	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Nov. 11, 2019
Debt Securities, Available-for-sale [Line Items]
Long-term investments				$ 52,528,000	$ 61,723,000
Proceeds from long-term equity method investment, gross				54,089,000
Proceeds from long-term equity method investment				53,901,000	17,875,000	$ 7,007,000
Proceeds from sale or liquidation of long-term investments				32,572,000	8,256,000	19,487,000
Sale of investment securities				30,458,000	21,879,000	18,628,000
Equity securities without readily determinable fair values				5,200,000	6,200,000
Impairment or other adjustments related to observable price changes				0	0	0
Cash distributions, investing cash inflows						5,535,000
Cash distributions, operating cash inflows						1,472,000
Quoted Prices in Active Markets for Identical Assets (Level 1)
Debt Securities, Available-for-sale [Line Items]
Long-term investments				2,077,000
NAV
Debt Securities, Available-for-sale [Line Items]
Proceeds from long-term equity method investment				32,676,000	8,320,000
Proceeds from sale or liquidation of long-term investments				$ 32,572,000	8,256,000	$ 13,952,000
In-transit redemptions					$ 8,502,000
Castle Brands
Debt Securities, Available-for-sale [Line Items]
Cash tender offer (in dollars per share)		$ 1.27
Tendered common shares (in shares)		12,895,017
Gain on sale of investment		$ 16,377,000
Ladenburg Thalmann Financial Services Inc. (“LTS”) \| LTS Common Stock \| Equity Method Investee \| Common Stock
Debt Securities, Available-for-sale [Line Items]
Equity method ownership percentage	10.20%
Cash tender offer (in dollars per share)							$ 3.50
Proceeds from common shares of LTS	$ 53,169,000
Ladenburg Thalmann Financial Services Inc. (“LTS”) \| LTS Preferred \| Equity Method Investee \| Series A Cumulative Redeemable Preferred Stock
Debt Securities, Available-for-sale [Line Items]
Proceeds from common shares of LTS			$ 6,009,000
Preferred stock dividend rate				8.00%
Liquidation preference (in dollars per share)				$ 25.00
Mutual fund and hedge funds \| Minimum
Debt Securities, Available-for-sale [Line Items]
Equity method ownership percentage				6.18%
Mutual fund and hedge funds \| Maximum
Debt Securities, Available-for-sale [Line Items]
Equity method ownership percentage				37.04%