Non-controlling Interests (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Variable Interest Entity [Line Items]
Non-controlling interest in net income (loss)	$ 15,696	$ (3,071)	$ 14,791	$ 4,879
Non-redeemable non-controlling interest	30,549		30,549		$ 24,473
Redeemable non-controlling interest	139,798		139,798		13,203
CPH acquisition
Variable Interest Entity [Line Items]
Redeemable non-controlling interest	9,903		9,903		13,203
Consolidated private equity fund
Variable Interest Entity [Line Items]
Non-controlling interest in net income (loss)	0	(3,209)	0	4,507
Non-redeemable non-controlling interest	0		0		23,171
Other
Variable Interest Entity [Line Items]
Non-controlling interest in net income (loss)	142	138	343	372
Non-redeemable non-controlling interest	1,668		1,668		1,302
Consolidated VIEs
Variable Interest Entity [Line Items]
Non-controlling interest in net income (loss)	15,554	$ 0	14,448	$ 0
Non-redeemable non-controlling interest	28,881		28,881		0
Redeemable non-controlling interest	$ 129,895		$ 129,895		$ 0