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Consolidation of Sponsored Investment Products (Details 1) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Consolidated Statement of Operations        
Total operating revenues $ 71,951 $ 55,457 $ 201,167 $ 148,480
Total operating expense 54,184 57,650 161,194 142,771
Operating Income (Loss) 17,767 (2,193) 39,973 5,709
Total other non-operating income (expense) 1,154   1,966  
Income (loss) before income tax expense 18,921 (3,873) 41,939 4,364
income tax expense 7,279 (1,095) 16,480 (391)
Net Income (Loss) 11,642 (2,778) 25,459 4,755
Allocation of earnings to preferred stockholders 0 0 (64) (476)
Less: Net Income (loss)attributable to noncontrolling interest 0      
Net income (loss) attributable to the company 11,642 (3,483) 25,395 2,166
Balance Before Consolidation of Investment Products [Member]
        
Consolidated Statement of Operations        
Total operating revenues 71,825   201,041  
Total operating expense 54,030   161,040  
Operating Income (Loss) 17,795   40,001  
Total other non-operating income (expense) 1,126   1,938  
Income (loss) before income tax expense 18,921   41,939  
income tax expense 7,279   16,480  
Net Income (Loss) 11,642   25,459  
Allocation of earnings to preferred stockholders     (64)  
Less: Net Income (loss)attributable to noncontrolling interest 0      
Net income (loss) attributable to the company 11,642   25,395  
Consolidated Investment Products [Member]
        
Consolidated Statement of Operations        
Total operating revenues 0   0  
Total operating expense 28   28  
Operating Income (Loss) (28)   (28)  
Total other non-operating income (expense) 639   639  
Income (loss) before income tax expense 611   611  
income tax expense 0   0  
Net Income (Loss) 611   611  
Allocation of earnings to preferred stockholders     0  
Less: Net Income (loss)attributable to noncontrolling interest 0      
Net income (loss) attributable to the company 611   611  
Eliminations and Adjustments [Member]
        
Consolidated Statement of Operations        
Total operating revenues 126   126  
Total operating expense 126   126  
Operating Income (Loss) 0   0  
Total other non-operating income (expense) (611)   (611)  
Income (loss) before income tax expense (611)   (611)  
income tax expense 0   0  
Net Income (Loss) (611)   (611)  
Allocation of earnings to preferred stockholders         
Less: Net Income (loss)attributable to noncontrolling interest 0      
Net income (loss) attributable to the company $ (611)   $ (611)