Consolidation - Revenue and Expenses of Consolidated Investment Product (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Expenses:
Other operating expenses	$ 20,350	$ 17,733	$ 56,340	$ 51,195
Noncontrolling interest	(933)	(1,731)	(1,619)	(2,782)
Net Income (Loss) Attributable to Common Stockholders	$ 24,913	$ 16,708	67,115	$ 25,262
CLOs
Income:
Realized and unrealized gain (loss), net			(3,587)
Interest income			70,404
Total revenues			66,817
Expenses:
Other operating expenses			2,065
Interest expense			46,786
Total Expense			48,851
Noncontrolling interest			(876)
Net Income (Loss) Attributable to Common Stockholders			$ 17,090