Investment Securities (Equity in Earnings of Investments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Equity in earnings from investments	$ 2,675	$ 56,268	$ 17,000
Mutual fund and hedge funds
Schedule of Equity Method Investments [Line Items]
Equity in earnings from investments	2,675	2,844	958
Ladenburg Thalmann Financial Services Inc.
Schedule of Equity Method Investments [Line Items]
Equity in earnings from investments	0	53,424	(410)
Castle Brands Inc.
Schedule of Equity Method Investments [Line Items]
Equity in earnings from investments	$ 0	$ 0	$ 16,452