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Investment in Securities (Proceeds, Realized Gains (Losses) on Sales) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Securities, Available-for-sale [Line Items]    
Proceeds $ 488,128 $ 1,544,862
Available-for-sale Securities, Gross Realized Gains 15,467 20,280
Available-for-sale Securities, Gross Realized Losses (10,631) (23,893)
Available-for-sale Securities, Gross Realized Gain (Loss) 4,836 (3,613)
Agency RMBS    
Securities, Available-for-sale [Line Items]    
Proceeds 331,572 719,082
Available-for-sale Securities, Gross Realized Gains 4,511 6,955
Available-for-sale Securities, Gross Realized Losses (696) (3,800)
Available-for-sale Securities, Gross Realized Gain (Loss) 3,815 3,155
Non-Agency RMBS and CMBS    
Securities, Available-for-sale [Line Items]    
Proceeds 16,496 165,180
Available-for-sale Securities, Gross Realized Gains 9,606 11,356
Available-for-sale Securities, Gross Realized Losses (1,093) (5,726)
Available-for-sale Securities, Gross Realized Gain (Loss) 8,513 5,630
CLOs    
Securities, Available-for-sale [Line Items]    
Proceeds 2,060 58,157
Available-for-sale Securities, Gross Realized Gains 1,287 1,169
Available-for-sale Securities, Gross Realized Losses (7,267) (10,999)
Available-for-sale Securities, Gross Realized Gain (Loss) (5,980) (9,830)
Other Securities    
Securities, Available-for-sale [Line Items]    
Proceeds 138,000 602,443
Available-for-sale Securities, Gross Realized Gains 63 800
Available-for-sale Securities, Gross Realized Losses (1,575) (3,368)
Available-for-sale Securities, Gross Realized Gain (Loss) $ (1,512) $ (2,568)