Consolidated Sponsored Investment Products - Derivatives, Net Gains (Losses) (Details) - Consolidated Sponsored Investment Products [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses)	$ 745
Interest Rate Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses)	(80)
Foreign Exchange Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses)	181
Equity Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses)	312
Commodity Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses)	324
Credit Risk Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses)	$ 8