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Investment Securities - Consolidated sponsored funds (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2014
Investment Securities
Cash		$ 467,458	$ 558,495	$ 614,865	$ 566,621
Redeemable noncontrolling interests		(10,865)
Deconsolidated sponsored funds value	$ 44,200
Consolidated Sponsored Funds
Investment Securities
Cash		7,801
Investments		111,803
Other assets		2,014
Other liabilities		(955)
Redeemable noncontrolling interests		(10,865)
Net interest in consolidated sponsored funds		$ 109,798