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Investment Securities - Consolidated sponsored funds (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014
Investment Securities
Cash		$ 529,784	$ 558,495	$ 612,660	$ 566,621
Redeemable noncontrolling interests		(10,372)
Deconsolidated sponsored funds value	$ 44,200
Consolidated Sponsored Funds
Investment Securities
Cash		4,524
Investments		123,792
Other assets		1,017
Other liabilities		(1,093)
Redeemable noncontrolling interests		(10,372)
Net interest in consolidated sponsored funds		$ 117,868