Investment Securities (Narrative) (Details) - USD ($)			12 Months Ended
	Feb. 14, 2020	Oct. 09, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Nov. 11, 2019
Debt Securities, Available-for-sale [Line Items]
Long-term investments			$ 53,073,000	$ 52,291,000
Dividends received			50,000
Proceeds from long-term equity method investment				53,901,000	$ 17,875,000
Proceeds from sale or liquidation of long-term investments			11,509,000	32,572,000	8,256,000
Other equity securities at cost			5,200,000	5,200,000
Impairment or other adjustments related to observable price changes			0	0	0
Proceeds from long-term equity method investment, gross				54,089,000
Distributions from real estate ventures			25,326,000	1,933,000	7,028,000
Quoted Prices in Active Markets for Identical Assets (Level 1)
Debt Securities, Available-for-sale [Line Items]
Long-term investments			514,000
NAV
Debt Securities, Available-for-sale [Line Items]
Proceeds from long-term equity method investment			11,642,000	32,676,000	8,256,000
Proceeds from sale or liquidation of long-term investments			$ 11,509,000	32,572,000	8,320,000
In-transit redemptions					$ 8,502,000
Castle Brands Inc.
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 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
Investment owned (in shares)	15,191,205
Ladenburg Thalmann Financial Services Inc. | 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
Investment owned (in shares)				240,000
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			6.43%
Mutual fund and hedge funds | Maximum
Debt Securities, Available-for-sale [Line Items]
Equity method ownership percentage			37.78%