Consolidation - Revenue and Expenses of Consolidated Investment Product (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Expenses:
Other operating expenses	$ 18,228	$ 20,350	$ 56,125	$ 56,340
Noncontrolling interests	(1,274)	(933)	(2,969)	(1,619)
Net Income (Loss) Attributable to Common Stockholders	$ 22,000	$ 24,913	66,504	$ 67,115
CLOs
Income:
Realized and unrealized gain (loss), net			(2,116)
Interest income			85,346
Total revenues			83,230
Expenses:
Other operating expenses			2,960
Interest expense			72,030
Total Expense			74,990
Noncontrolling interests			297
Net Income (Loss) Attributable to Common Stockholders			$ 8,537