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Investment in Securities (Proceeds, Realized Gains (Losses) on Sales) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Securities, Available-for-sale [Line Items]  
Proceeds $ 1,893,925
Available-for-sale Securities, Gross Realized Gains 23,957
Available-for-sale Securities, Gross Realized Losses (36,599)
Available-for-sale Securities, Gross Realized Gain (Loss) (12,642)
Agency RMBS  
Securities, Available-for-sale [Line Items]  
Proceeds 1,010,251
Available-for-sale Securities, Gross Realized Gains 9,006
Available-for-sale Securities, Gross Realized Losses (4,924)
Available-for-sale Securities, Gross Realized Gain (Loss) 4,082
Non-Agency RMBS and CMBS  
Securities, Available-for-sale [Line Items]  
Proceeds 184,725
Available-for-sale Securities, Gross Realized Gains 12,552
Available-for-sale Securities, Gross Realized Losses (7,348)
Available-for-sale Securities, Gross Realized Gain (Loss) 5,204
CLOs  
Securities, Available-for-sale [Line Items]  
Proceeds 62,063
Available-for-sale Securities, Gross Realized Gains 1,286
Available-for-sale Securities, Gross Realized Losses (19,464)
Available-for-sale Securities, Gross Realized Gain (Loss) (18,178)
Other Securities  
Securities, Available-for-sale [Line Items]  
Proceeds 636,886
Available-for-sale Securities, Gross Realized Gains 1,113
Available-for-sale Securities, Gross Realized Losses (4,863)
Available-for-sale Securities, Gross Realized Gain (Loss) $ (3,750)