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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%