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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
 12 Months Ended
Dec. 31, 2018
USD ($)
Line of Credit Facility [Line Items]  
Securities sold under agreements to repurchase, gross $ 1,897,077
Amortized Cost of Collateral 3,197,900
JP Morgan Facility [Member]  
Line of Credit Facility [Line Items]  
Securities sold under agreements to repurchase, gross 728,638
Amortized Cost of Collateral 1,374,235
Maximum Month-End Balance 1,000,854
Average Month-End Balance 885,203
DB Repurchase Facility [Member]  
Line of Credit Facility [Line Items]  
Securities sold under agreements to repurchase, gross 570,642
Amortized Cost of Collateral 921,424
Maximum Month-End Balance 707,405
Average Month-End Balance 524,727
Goldman Facility [Member]  
Line of Credit Facility [Line Items]  
Securities sold under agreements to repurchase, gross 210,072
Amortized Cost of Collateral 362,577
Maximum Month-End Balance 261,691
Average Month-End Balance 176,145
HSBC Facility [Member]  
Line of Credit Facility [Line Items]  
Securities sold under agreements to repurchase, gross 48,835
Amortized Cost of Collateral 69,433
Maximum Month-End Balance 49,896
Average Month-End Balance 49,107
USD | CS Facility [Member]  
Line of Credit Facility [Line Items]  
Securities sold under agreements to repurchase, gross 187,117
Amortized Cost of Collateral 254,064
Maximum Month-End Balance 189,839
Average Month-End Balance 109,453
GBP | CS Facility [Member]  
Line of Credit Facility [Line Items]  
Securities sold under agreements to repurchase, gross 151,773
Amortized Cost of Collateral 216,167
Maximum Month-End Balance 151,915
Average Month-End Balance $ 147,651