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Consolidated K-Series - Condensed Statement of Operations of Consolidated K-Series (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Condensed Income Statements, Captions [Line Items]
Interest expense	$ 19,829	$ 147,631	$ 202,807	$ 410,976
NET INTEREST INCOME	25,529	31,971	101,134	83,866
Unrealized gains (losses), net	$ 81,198	11,112	(212,711)	13,898
VIE, Primary Beneficiary | Consolidated K-Series
Condensed Income Statements, Captions [Line Items]
Interest income		139,818	151,841	384,743
Interest expense		120,329	129,762	332,041
NET INTEREST INCOME		19,489	22,079	52,702
Unrealized gains (losses), net		7,630	(10,951)	22,247
Net income		$ 27,119	$ 11,128	$ 74,949

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