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Consolidated K-Series - Condensed Statement of Operations of Consolidated K-Series (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Condensed Income Statements, Captions [Line Items]
Interest expense	$ 163,531	$ 121,779
NET INTEREST INCOME	47,082	26,203
Unrealized (losses) gains, net	(396,780)	2,708
VIE, Primary Beneficiary | Consolidated K-Series
Condensed Income Statements, Captions [Line Items]
Interest income	151,841	111,768
Interest expense	129,762	96,797
NET INTEREST INCOME	22,079	14,971
Unrealized (losses) gains, net	(10,951)	9,410
Net income	$ 11,128	$ 24,381

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