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Secured Debt Arrangements, Net - Summary of Outstanding Balances, Maximum and Average Balances of Borrowings (Details) - Line of Credit [Member]
$ in Thousands
 3 Months Ended
Mar. 31, 2019
USD ($)
Line of Credit Facility [Line Items]  
Securities sold under agreements to repurchase, gross $ 2,159,767
Amortized Cost of Collateral 3,679,993
JP Morgan Facility [Member]  
Line of Credit Facility [Line Items]  
Securities sold under agreements to repurchase, gross 923,336
Amortized Cost of Collateral 1,612,510
Maximum Month-End Balance 929,496
Average Month-End Balance 925,679
DB Repurchase Facility [Member]  
Line of Credit Facility [Line Items]  
Securities sold under agreements to repurchase, gross 616,952
Amortized Cost of Collateral 1,013,662
Maximum Month-End Balance 672,477
Average Month-End Balance 636,283
Goldman Facility [Member]  
Line of Credit Facility [Line Items]  
Securities sold under agreements to repurchase, gross 233,312
Amortized Cost of Collateral 517,122
Maximum Month-End Balance 259,167
Average Month-End Balance 250,286
HSBC Facility [Member]  
Line of Credit Facility [Line Items]  
Securities sold under agreements to repurchase, gross 49,911
Amortized Cost of Collateral 71,141
Maximum Month-End Balance 50,784
Average Month-End Balance 50,296
USD | CS Facility [Member]  
Line of Credit Facility [Line Items]  
Securities sold under agreements to repurchase, gross 188,037
Amortized Cost of Collateral 254,090
Maximum Month-End Balance 188,037
Average Month-End Balance 187,424
GBP | CS Facility [Member]  
Line of Credit Facility [Line Items]  
Securities sold under agreements to repurchase, gross 148,219
Amortized Cost of Collateral 211,468
Maximum Month-End Balance 150,811
Average Month-End Balance $ 145,814