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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