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Investment Securities Available for Sale, at Fair Value - Schedule of Investment Securities Available for Sale-Fair Value Option (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Debt and Equity Securities, FV-NI [Line Items]
Amortized Cost	$ 533,307	$ 244,735
Gains	467	2,998
Losses	(88,998)	(2,405)
Fair Value	444,776	245,328
VIE, Primary Beneficiary | Consolidated K-Series
Debt and Equity Securities, FV-NI [Line Items]
Securities owned, fair value	237,300
Agency RMBS
Debt and Equity Securities, FV-NI [Line Items]
Amortized Cost	0	21,033
Gains	0	0
Losses	0	(55)
Fair Value	0	20,978
Agency CMBS
Debt and Equity Securities, FV-NI [Line Items]
Amortized Cost	0	31,076
Gains	0	0
Losses	0	(395)
Fair Value	0	30,681
Total Agency
Debt and Equity Securities, FV-NI [Line Items]
Amortized Cost	0	52,109
Gains	0	0
Losses	0	(450)
Fair Value	0	51,659
Non-Agency RMBS
Debt and Equity Securities, FV-NI [Line Items]
Amortized Cost	252,456	122,628
Gains	467	2,435
Losses	(48,278)	(1,248)
Fair Value	204,645	123,815
CMBS
Debt and Equity Securities, FV-NI [Line Items]
Amortized Cost	231,031	20,096
Gains	0	563
Losses	(33,244)	(19)
Fair Value	197,787	20,640
CMBS | VIE, Primary Beneficiary | Consolidated K-Series
Debt and Equity Securities, FV-NI [Line Items]
Securities owned, fair value	124,200
ABS
Debt and Equity Securities, FV-NI [Line Items]
Amortized Cost	49,820	49,902
Gains	0	0
Losses	(7,476)	(688)
Fair Value	42,344	49,214
Agency Fixed- Rate | Agency RMBS
Debt and Equity Securities, FV-NI [Line Items]
Amortized Cost	0	21,033
Gains	0	0
Losses	0	(55)
Fair Value	$ 0	$ 20,978

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