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Secured Debt Arrangements, Net - Summary of Outstanding Balances, Maximum and Average Balances of Borrowings (Details) - Line of Credit - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Line of Credit Facility [Line Items] |  |
Balance | $ 3,430,379 | $ 3,449,665
Amortized Cost of Collateral | 5,319,621 | 5,418,999
JPMorgan |  |
Line of Credit Facility [Line Items] |  |
Balance | 1,096,406 | 1,170,969
Amortized Cost of Collateral | 1,855,536 | 2,009,249
Maximum Month-End Balance | 1,172,308 | 1,192,288
Average Month-End Balance | 1,146,506 | 1,119,997
DB |  |
Line of Credit Facility [Line Items] |  |
Balance | 425,803 | 520,457
Amortized Cost of Collateral | 658,672 | 814,715
Maximum Month-End Balance | 520,217 | 526,743
Average Month-End Balance | 488,746 | 506,831
Goldman |  |
Line of Credit Facility [Line Items] |  |
Balance | 322,217 | 332,352
Amortized Cost of Collateral | 501,146 | 510,371
Maximum Month-End Balance | 331,154 | 362,139
Average Month-End Balance | 327,536 | 343,621
CS Facility | USD |  |
Line of Credit Facility [Line Items] |  |
Balance | 220,193 | 369,182
Amortized Cost of Collateral | 331,053 | 524,139
Maximum Month-End Balance | 369,182 | 378,781
Average Month-End Balance | 318,853 | 348,464
CS Facility | Fx contracts - GBP |  |
Line of Credit Facility [Line Items] |  |
Balance |  | 0
Amortized Cost of Collateral |  | 0
Maximum Month-End Balance |  | 90,111
Average Month-End Balance |  | 43,094
HSBC Facility | USD |  |
Line of Credit Facility [Line Items] |  |
Balance |  | 0
Amortized Cost of Collateral |  | 0
Maximum Month-End Balance |  | 50,625
Average Month-End Balance |  | 44,000
HSBC Facility | Fx contracts - GBP |  |
Line of Credit Facility [Line Items] |  |
Balance |  | 0
Amortized Cost of Collateral |  | 0
Maximum Month-End Balance |  | 34,500
Average Month-End Balance |  | 20,563
HSBC Facility | Fx contracts - EUR |  |
Line of Credit Facility [Line Items] |  |
Balance | 157,270 | 163,785
Amortized Cost of Collateral | 207,182 | 215,509
Maximum Month-End Balance | 162,715 | 163,788
Average Month-End Balance | 160,628 | 154,725
Barclays Facility | USD |  |
Line of Credit Facility [Line Items] |  |
Balance | 35,192 | 35,192
Amortized Cost of Collateral | 50,057 | 49,993
Maximum Month-End Balance | 35,193 | 35,193
Average Month-End Balance | 35,193 | 29,327
Barclays Facility | Fx contracts - GBP |  |
Line of Credit Facility [Line Items] |  |
Balance |  | 0
Amortized Cost of Collateral |  | 0
Maximum Month-End Balance |  | 666,810
Average Month-End Balance |  | 260,692
Barclays Facility | Fx contracts - EUR |  |
Line of Credit Facility [Line Items] |  |
Balance |  | 0
Amortized Cost of Collateral |  | 0
Maximum Month-End Balance |  | 180,595
Average Month-End Balance |  | 70,521
Barclays Securitization |  |
Line of Credit Facility [Line Items] |  |
Balance | 1,173,298 | 857,728
Amortized Cost of Collateral | 1,715,975 | 1,295,023
Maximum Month-End Balance | 1,173,298 | 857,728
Average Month-End Balance | $ 1,023,076 | $ 823,915

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