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Consolidated K-Series - Condensed Statement of Operations of Consolidated K-Series (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Condensed Income Statements, Captions [Line Items]
Interest expense	$ 19,444	$ 141,567	$ 182,976	$ 263,344
NET INTEREST INCOME	28,526	25,691	75,607	51,896
Unrealized gains (losses), net	$ 102,872	78	(293,908)	2,786
VIE, Primary Beneficiary | Consolidated K-Series
Condensed Income Statements, Captions [Line Items]
Interest income		133,157	151,841	244,925
Interest expense		114,914	129,762	211,711
NET INTEREST INCOME		18,243	22,079	33,214
Unrealized gains (losses), net		5,207	(10,951)	14,617
Net income		$ 23,450	$ 11,128	$ 47,831

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