Long-Term Investments (Equity-Method Investments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]
Investments accounted for under the equity method	$ 17,721	$ 21,495
Distributions of equity method investment	1,158	2,364	$ 3,283
Equity in (losses) earnings from investments	(2,754)	(2,681)	$ 3,140
Indian Creek Investors LP
Schedule of Equity Method Investments [Line Items]
Investments accounted for under the equity method	$ 5,248	4,989
Equity method ownership percentage	20.22%
Boyar Value Fund
Schedule of Equity Method Investments [Line Items]
Investments accounted for under the equity method	$ 7,816	7,302
Equity method ownership percentage	31.99%
Quoted market value	$ 7,816
Ladenburg Thalmann Financial Services Inc.
Schedule of Equity Method Investments [Line Items]
Equity method ownership percentage	8.28%
Ladenburg Thalmann Financial Services Inc.
Schedule of Equity Method Investments [Line Items]
Investments accounted for under the equity method	$ 4,657	9,204
Quoted market value	37,067
Difference between carrying amount and underlying equity	24,431
Castle Brands, Inc.
Schedule of Equity Method Investments [Line Items]
Investments accounted for under the equity method	$ 0	$ 0
Equity method ownership percentage	7.88%
Quoted market value	$ 9,630
Difference between carrying amount and underlying equity	$ 1,857
Equity Method Investee | Ladenburg Thalmann Financial Services Inc.
Schedule of Equity Method Investments [Line Items]
Equity method ownership percentage	8.28%