Consolidation - Revenue and Expenses of Consolidated Investment Product (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Expenses:
Other operating expenses	$ 19,128	$ 20,236	$ 35,990	$ 33,462
Noncontrolling interest	(159)	(333)	(686)	(1,051)
Net Income (Loss) Attributable to Common Stockholders	$ 20,986	$ (2,389)	42,202	$ 8,554
CLOs
Income:
Realized and unrealized gain (loss), net			1,935
Interest income			44,259
Total revenues			46,194
Expenses:
Other operating expenses			1,830
Interest expense			29,827
Total Expense			31,657
Noncontrolling interest			(767)
Net Income (Loss) Attributable to Common Stockholders			$ 13,770