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Investment in Securities (Proceeds, Realized Gains (Losses) on Sales) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Securities, Available-for-sale [Line Items]    
Proceeds $ 366,061 $ 1,071,720
Available-for-sale Securities, Gross Realized Gains 2,878 5,566
Available-for-sale Securities, Gross Realized Losses 7,018 14,066
Available-for-sale Securities, Gross Realized Gain (Loss) (4,140) (8,500)
Agency RMBS    
Securities, Available-for-sale [Line Items]    
Proceeds 259,207 387,511
Available-for-sale Securities, Gross Realized Gains 1,872 2,578
Available-for-sale Securities, Gross Realized Losses 1,565 3,238
Available-for-sale Securities, Gross Realized Gain (Loss) 307 (660)
Non-Agency RMBS and CMBS    
Securities, Available-for-sale [Line Items]    
Proceeds 19,139 148,684
Available-for-sale Securities, Gross Realized Gains 825 2,092
Available-for-sale Securities, Gross Realized Losses 1,536 4,975
Available-for-sale Securities, Gross Realized Gain (Loss) (711) (2,883)
CLOs    
Securities, Available-for-sale [Line Items]    
Proceeds 11,275 56,097
Available-for-sale Securities, Gross Realized Gains 54 152
Available-for-sale Securities, Gross Realized Losses 3,109 4,002
Available-for-sale Securities, Gross Realized Gain (Loss) (3,055) (3,850)
Other Securities    
Securities, Available-for-sale [Line Items]    
Proceeds 76,440 479,428
Available-for-sale Securities, Gross Realized Gains 127 744
Available-for-sale Securities, Gross Realized Losses 808 1,851
Available-for-sale Securities, Gross Realized Gain (Loss) $ (681) $ (1,107)