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Related Party Transactions (Details) - Affiliated Funds - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Related Party Transactions, Revenue [Abstract]          
Investment advisory and administration fees $ 55,817 $ 55,839 $ 107,728 $ 111,948  
Distribution and service fees 4,671 4,014 8,904 7,920  
Total 60,488 59,853 116,632 119,868  
Related Party Transactions Summary [Abstract]          
Dividend income 270 300 270 300  
Fund expenses, included in general and administrative expenses 1,789 $ 2,084 3,823 $ 4,478  
Receivables due from company-sponsored funds $ 19,989   $ 19,989   $ 19,209