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Derivative Instruments - Gain or Loss (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Amounts recognized on the statements of operations related to the Company's derivatives    
Other Settlements / Expirations $ (135) $ (4,889)
Return (Recovery) of Basis (8,807) 11,313
Total (189,691) (27,148)
Derivative instruments not accounted as hedges under GAAP    
Amounts recognized on the statements of operations related to the Company's derivatives    
Other Settlements / Expirations (83) (5,095)
Variation Margin Settlement (179,759) (37,838)
Return (Recovery) of Basis (283) 933
Mark-to-Market (8,807) 11,313
Contractual interest income (expense), net (759) 3,539
Total (189,691) (27,148)
Interest rate swaps | Derivative instruments not accounted as hedges under GAAP    
Amounts recognized on the statements of operations related to the Company's derivatives    
Other Settlements / Expirations (262) (3)
Variation Margin Settlement (179,759) (37,838)
Return (Recovery) of Basis 262 1,528
Mark-to-Market (2,515) 7,090
Contractual interest income (expense), net (1,395) 2,755
Total (183,669) (26,468)
Interest Rate Swaption | Derivative instruments not accounted as hedges under GAAP    
Amounts recognized on the statements of operations related to the Company's derivatives    
Mark-to-Market 181  
Total 181  
Agency RMBS Interest-Only Strips accounted for as derivatives, included in MBS | Derivative instruments not accounted as hedges under GAAP    
Amounts recognized on the statements of operations related to the Company's derivatives    
Return (Recovery) of Basis (545) (595)
Mark-to-Market (839) (59)
Contractual interest income (expense), net 636 784
Total (748) 130
Futures contracts | Derivative instruments not accounted as hedges under GAAP    
Amounts recognized on the statements of operations related to the Company's derivatives    
Other Settlements / Expirations   (4,503)
Mark-to-Market   4,657
Total   154
Credit default swaps | Derivative instruments not accounted as hedges under GAAP    
Amounts recognized on the statements of operations related to the Company's derivatives    
Other Settlements / Expirations (1,315) (589)
Mark-to-Market (2,638) (375)
Total (3,953) $ (964)
TBAs | Derivative instruments not accounted as hedges under GAAP    
Amounts recognized on the statements of operations related to the Company's derivatives    
Other Settlements / Expirations 1,494  
Mark-to-Market (2,996)  
Total $ (1,502)