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Fair Value Measurements - Interest Only MBS (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Interest income [1] $ 251,344 $ 201,194  
Non-Agency RMBS, at fair value 3,228,391   $ 3,330,063
Agency MBS, at fair value 4,101,851   4,167,754
Residential Mortgage-Backed Securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value 7,330,242   7,497,817
Residential Mortgage-Backed Securities | Agency MBS - Interest-only      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value 131,189   144,800
Interest-Only RMBS | Residential Mortgage-Backed Securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Interest income 9,000 $ 12,000  
Interest-Only RMBS | Residential Mortgage-Backed Securities | Non-Agency RMBS - Interest-only      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Non-Agency RMBS, at fair value 251,000   266,000
Interest-Only RMBS | Residential Mortgage-Backed Securities | Agency MBS - Interest-only      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Agency MBS, at fair value $ 131,000   $ 145,000
[1] Includes interest income of consolidated VIEs of $192,989 and $131,980 for the quarters ended March 31, 2017 and 2016 respectively. See Note 8 to consolidated financial statements for further discussion.