Consolidation - Revenue and Expenses of Consolidated Investment Product (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income:
Total revenues	$ 123,675	$ 82,324	$ 297,583	$ 242,704
Expenses:
Other operating expenses	17,733	11,392	51,195	34,614
Noncontrolling interest	(1,731)	(651)	(2,782)	(770)
Net Income (Loss) Attributable to Common Stockholders	$ 16,708	$ 15,625	25,262	$ 36,076
CLOs
Income:
Realized and unrealized gain (loss), net			11,063
Interest income			25,458
Other income			542
Total revenues			37,063
Expenses:
Other operating expenses			6,404
Interest expense			22,101
Total Expense			28,505
Noncontrolling interest			(1,073)
Net Income (Loss) Attributable to Common Stockholders			$ 7,485