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Secured Debt Arrangements, Net - Summary of Outstanding Balances, Maximum and Average Balances of Borrowings (Details) - Line of Credit [Member] - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Line of Credit Facility [Line Items]    
Securities sold under agreements to repurchase, gross $ 1,345,195 $ 1,146,566
JP Morgan Chase [Member]    
Line of Credit Facility [Line Items]    
Securities sold under agreements to repurchase, gross 944,529 657,452
Maximum Month-End Balance 986,611 783,528
Average Month-End Balance 863,717 660,741
Deutsche Bank Repurchase Facility [Member]    
Line of Credit Facility [Line Items]    
Securities sold under agreements to repurchase, gross 319,286 137,355
Maximum Month-End Balance 367,010 137,355
Average Month-End Balance 288,966 19,582
Goldman Sachs Repurchase Facility [Member]    
Line of Credit Facility [Line Items]    
Securities sold under agreements to repurchase, gross 81,380 40,657
Maximum Month-End Balance 81,380 45,928
Average Month-End Balance 40,514 43,505
UBS [Member]    
Line of Credit Facility [Line Items]    
Securities sold under agreements to repurchase, gross 0 133,899
Maximum Month-End Balance 133,899 133,899
Average Month-End Balance 72,716 133,899
Deutsche Bank [Member]    
Line of Credit Facility [Line Items]    
Securities sold under agreements to repurchase, gross 0 177,203
Maximum Month-End Balance 177,203 300,005
Average Month-End Balance $ 117,768 $ 246,773