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Long-Term Investments (Equity-Method Investments) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]          
Investments accounted for under the equity method $ 20,341   $ 20,341   $ 21,495
Distributions of equity method investment     572 $ 1,754  
Equity in earnings (losses) from investments 1,089 $ (2,163) (582) $ (1,551)  
Indian Creek Investors LP          
Schedule of Equity Method Investments [Line Items]          
Investments accounted for under the equity method $ 4,929   $ 4,929   4,989
Equity-method ownership percentage 20.13%   20.13%    
Boyar Value Fund          
Schedule of Equity Method Investments [Line Items]          
Investments accounted for under the equity method $ 7,312   $ 7,312   7,302
Equity-method ownership percentage 30.65%   30.65%    
Quoted market value $ 7,312   $ 7,312    
Ladenburg Thalmann Financial Services Inc.          
Schedule of Equity Method Investments [Line Items]          
Investments accounted for under the equity method $ 8,100   $ 8,100   9,204
Equity-method ownership percentage 7.75%   7.75%    
Quoted market value $ 33,491   $ 33,491    
Castle Brands, Inc.          
Schedule of Equity Method Investments [Line Items]          
Investments accounted for under the equity method $ 0   $ 0   $ 0
Equity-method ownership percentage 7.91%   7.91%    
Quoted market value $ 9,250   $ 9,250