Consolidation - Revenue and Expenses of Consolidated Investment Product (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income:
Realized and unrealized gain, net	$ 961	$ (2,082)	$ 3,584	$ (1,194)
Interest Income	221	324	1,113	906
Total revenues	82,324	92,375	242,704	295,862
Expenses:
Other operating expenses	11,392	11,165	34,614	51,403
Net Income (Loss) Attributable to Common Stockholders	15,625	(649)	36,076	28,470
Consolidated Investment Product [Member]
Income:
Realized and unrealized gain, net	144	(721)	2,960	(721)
Interest Income	4,047	42	8,835	42
Total revenues	4,191		11,795
Expenses:
Other operating expenses	24	0	3,921	0
Interest expense	3,788	$ 1	10,188	$ 1
Total Expense	3,812		14,109
Net Income (Loss) Attributable to Common Stockholders	$ 379		$ (2,314)