Non-controlling Interests (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Variable Interest Entity [Line Items]
Non-controlling interest in net income (loss)	$ 4,843	$ 6,675	$ (905)	$ 7,950
Non-redeemable non-controlling interest	17,515		17,515		$ 24,473
Redeemable non-controlling interest	224,566		224,566		13,203
CPH acquisition
Variable Interest Entity [Line Items]
Redeemable non-controlling interest	13,203		13,203		13,203
Consolidated private equity fund
Variable Interest Entity [Line Items]
Non-controlling interest in net income (loss)	0	6,579	0	7,716
Non-redeemable non-controlling interest	0		0		23,171
Other
Variable Interest Entity [Line Items]
Non-controlling interest in net income (loss)	101	96	201	234
Non-redeemable non-controlling interest	1,496		1,496		1,302
Consolidated VIEs
Variable Interest Entity [Line Items]
Non-controlling interest in net income (loss)	4,742	$ 0	(1,106)	$ 0
Non-redeemable non-controlling interest	16,019		16,019		0
Redeemable non-controlling interest	$ 211,363		$ 211,363		$ 0