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Investment in Securities (Proceeds, Realized Gains (Losses) on Sales) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Securities, Available-for-sale [Line Items]    
Available-for-sale securities Realizes Losses - adjustments to cost basis of certain securities $ (17,700) $ (28,700)
Proceeds 1,819,520 1,893,925
Available-for-sale Securities, Gross Realized Gains 32,736 23,957
Available-for-sale Securities, Gross Realized Losses (11,928) (7,937)
Available-for-sale Securities, Gross Realized Gain (Loss) 20,808 16,020
OTTI charge on securities   28,700
Agency RMBS    
Securities, Available-for-sale [Line Items]    
Proceeds 1,439,413 1,010,251
Available-for-sale Securities, Gross Realized Gains 16,260 9,006
Available-for-sale Securities, Gross Realized Losses (3,481) (2,254)
Available-for-sale Securities, Gross Realized Gain (Loss) 12,779 6,752
Non-Agency RMBS and CMBS    
Securities, Available-for-sale [Line Items]    
Proceeds 145,323 184,725
Available-for-sale Securities, Gross Realized Gains 13,692 12,552
Available-for-sale Securities, Gross Realized Losses (4,187) (4,869)
Available-for-sale Securities, Gross Realized Gain (Loss) 9,505 7,683
CLOs    
Securities, Available-for-sale [Line Items]    
Proceeds 46,632 62,063
Available-for-sale Securities, Gross Realized Gains 1,122 1,286
Available-for-sale Securities, Gross Realized Losses (4,251) (816)
Available-for-sale Securities, Gross Realized Gain (Loss) (3,129) 470
Other Securities    
Securities, Available-for-sale [Line Items]    
Proceeds 188,152 636,886
Available-for-sale Securities, Gross Realized Gains 1,662 1,113
Available-for-sale Securities, Gross Realized Losses (9) 2
Available-for-sale Securities, Gross Realized Gain (Loss) $ 1,653 $ 1,115