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Investments Gain on Securities, Net of Investment Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
(Loss) Gain on Investments [Line Items]      
(Loss) gain on securities, net [1] $ (5,264) $ 4,972 $ 16,986
Consolidated Investment Companies [Member]      
(Loss) Gain on Investments [Line Items]      
(Loss) gain on securities, net (4,000) (600) 2,600
Trading Securities [Member]      
(Loss) Gain on Investments [Line Items]      
Unrealized (loss) gain on trading securities (1,359) (2,578) 2,036
Realized gains [2] 910 4,514 1,306
Realized losses [2] (2,760) (1,848) (870)
Derivative [Member]      
(Loss) Gain on Investments [Line Items]      
Unrealized (loss) gain on derivatives [3] 119 (147) (49)
Realized gains [2],[3] 301 214 1,083
Realized losses [2],[3] (1,630) (451) (349)
Available-for-sale Securities [Member]      
(Loss) Gain on Investments [Line Items]      
Realized gains [2] 1,503 5,359 15,390
Realized losses [2] $ (2,348) [4] $ (91) $ (1,561)
[1] Amounts related to consolidated investment companies totaled $(4.0) million, $(0.6) million and $2.6 million for 2015, 2014 and 2013, respectively.
[2] Realized gains and losses are computed on a specific-identification basis.
[3] Amounts related to the settlement of economic derivatives held by certain consolidated sponsored products.
[4] The losses for the year ended December 31, 2015 include an impairment of an available-for-sale security.