Consolidation - Revenue and Expenses of Consolidated Investment Product (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Expenses:
Other operating expenses	$ 19,174	$ 19,128	$ 37,897	$ 35,990
Noncontrolling interests	(973)	(159)	(1,695)	(686)
Net Income (Loss) Attributable to Common Stockholders	$ 24,842	$ 20,986	44,504	$ 42,202
CLOs
Income:
Realized and unrealized gain (loss), net			3,384
Interest income			55,671
Total revenues			59,055
Expenses:
Other operating expenses			2,744
Interest expense			50,778
Total Expense			53,522
Noncontrolling interests			(229)
Net Income (Loss) Attributable to Common Stockholders			$ 5,304