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Secured Debt Arrangements, Net - Summary of Outstanding Balances, Maximum and Average Balances of Borrowings (Details) - Line of Credit $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Line of Credit Facility [Line Items]
Balance	$ 3,095,556
Amortized Cost of Collateral	4,852,087
JP Morgan Facility
Line of Credit Facility [Line Items]
Balance	1,234,759
Amortized Cost of Collateral	1,845,400
Maximum Month-End Balance	1,234,759
Average Month-End Balance	947,400
Deutsche Bank Repurchase Facility
Line of Credit Facility [Line Items]
Balance	513,876
Amortized Cost of Collateral	766,676
Maximum Month-End Balance	757,117
Average Month-End Balance	604,067
Goldman Facility
Line of Credit Facility [Line Items]
Balance	322,170
Amortized Cost of Collateral	513,559
Maximum Month-End Balance	324,821
Average Month-End Balance	246,318
USD | Credit Suisse Facility
Line of Credit Facility [Line Items]
Balance	218,644
Amortized Cost of Collateral	308,884
Maximum Month-End Balance	218,644
Average Month-End Balance	182,646
USD | HSBC Facility
Line of Credit Facility [Line Items]
Balance	50,625
Amortized Cost of Collateral	66,960
Maximum Month-End Balance	50,625
Average Month-End Balance	50,625
GBP | Credit Suisse Facility
Line of Credit Facility [Line Items]
Balance	93,915
Amortized Cost of Collateral	129,723
Maximum Month-End Balance	150,811
Average Month-End Balance	134,694
GBP | HSBC Facility
Line of Credit Facility [Line Items]
Balance	34,634
Amortized Cost of Collateral	49,976
Maximum Month-End Balance	50,784
Average Month-End Balance	42,296
GBP | Barclays Facility
Line of Credit Facility [Line Items]
Balance	290,347
Amortized Cost of Collateral	738,455
Maximum Month-End Balance	290,347
Average Month-End Balance	139,004
EUR | HSBC Facility
Line of Credit Facility [Line Items]
Balance	154,037
Amortized Cost of Collateral	190,780
Maximum Month-End Balance	154,037
Average Month-End Balance	151,889
EUR | Barclays Facility
Line of Credit Facility [Line Items]
Balance	182,549
Amortized Cost of Collateral	241,674
Maximum Month-End Balance	182,549
Average Month-End Balance	$ 181,159

X

- Definition

Securities Sold Under Agreements To Repurchase, Amortized Cost Of Collateral

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Average amount borrowed under the credit facility during the period.

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Maximum month-end amount borrowed under the credit facility during the period.

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