Non-controlling Interests (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Noncontrolling Interest [Line Items]
Non-controlling interest in net income (loss)	$ 16,318	$ (5,748)
Non-redeemable non-controlling interest	34,743		$ 36,172
Redeemable non-controlling interest	403,609		392,959
CPH acquisition
Noncontrolling Interest [Line Items]
Redeemable non-controlling interest	8,665		8,665
Other
Noncontrolling Interest [Line Items]
Non-controlling interest in net income (loss)	147	100
Non-redeemable non-controlling interest	1,773		1,550
Consolidated Investment Portfolios [Member]
Noncontrolling Interest [Line Items]
Non-controlling interest in net income (loss)	16,171	$ (5,848)
Non-redeemable non-controlling interest	32,970		34,622
Redeemable non-controlling interest	$ 394,944		$ 384,294