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(Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Derivative [Line Items]                      
Derivative assets, fair value $ 6,563       $ 2,940       $ 6,563 $ 2,940  
Derivative liabilities, fair value (1,218)       (269)       (1,218) (269)  
Gain (loss) on derivative instruments, net $ (81,981) $ 19,499 $ 20,667 $ 38,354 $ 12,678 $ 5,993 $ (15,802) $ 175 $ (3,461) $ 3,044 $ (5,606)
Derivative, Average Fixed Interest Rate, Current Effective 2.29%       1.36%       2.29% 1.36%  
Forward starting interest rate swap                      
Derivative [Line Items]                      
Derivative, Notional Amount $ (775,000)       $ (2,655,000)       $ (775,000) $ (2,655,000)  
Eurodollar futures                      
Derivative [Line Items]                      
Derivative Instruments Not Designated as Hedging Instruments, Gain                 1,887 821  
Derivative Instruments Not Designated as Hedging Instruments, Loss                     (4,815)
U.S. Treasury futures                      
Derivative [Line Items]                      
Derivative Instruments Not Designated as Hedging Instruments, Gain                   0 0
Derivative Instruments Not Designated as Hedging Instruments, Loss                 (4,609)    
Options on U.S. Treasury futures                      
Derivative [Line Items]                      
Derivative Instruments Not Designated as Hedging Instruments, Gain                   0 0
Derivative Instruments Not Designated as Hedging Instruments, Loss                 (658)    
Long [Member] | Interest rate swaps                      
Derivative [Line Items]                      
Derivative Instruments Not Designated as Hedging Instruments, Gain                   23 2,515
Derivative Instruments Not Designated as Hedging Instruments, Loss                 (1,658)    
Long [Member] | TBA securities                      
Derivative [Line Items]                      
Derivative Instruments Not Designated as Hedging Instruments, Gain                   5,757 0
Derivative Instruments Not Designated as Hedging Instruments, Loss                 (10,737)    
Short [Member] | Interest rate swaps                      
Derivative [Line Items]                      
Derivative Instruments Not Designated as Hedging Instruments, Gain                 12,021    
Derivative Instruments Not Designated as Hedging Instruments, Loss                   (2,655) (3,306)
Short [Member] | TBA securities                      
Derivative [Line Items]                      
Derivative Instruments Not Designated as Hedging Instruments, Gain                 293   $ 0
Derivative Instruments Not Designated as Hedging Instruments, Loss                   (902)  
Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest rate swaps                      
Derivative [Line Items]                      
Derivative assets, fair value 324       791       324 791  
Derivative, Notional Amount [1] $ (4,515,000)       $ (5,675,000)       $ (4,515,000) $ (5,675,000)  
Derivative, Average Fixed Interest Rate [2] 2.35%       1.71%       2.35% 1.71%  
Derivative, Average Remaining Maturity                 5 years 6 months 3 years 1 month 6 days  
Derivative, Fair Value, Net [3] $ 324       $ 791       $ 324 $ 791  
Not Designated as Hedging Instrument, Economic Hedge [Member] | Eurodollar futures                      
Derivative [Line Items]                      
Derivative assets, fair value 0       666       0 666  
Derivative, Notional Amount [4] 0       (1,950,000)       0 (1,950,000)  
Notional Amount of Derivative Instruments Added [4]                 0    
Notional Amount of Derivative Instruments Maturing, Settled, Terminated, or Paired-Off [4]                 (1,950,000)    
Not Designated as Hedging Instrument, Economic Hedge [Member] | U.S. Treasury futures                      
Derivative [Line Items]                      
Derivative, Notional Amount (50,000)       0       (50,000) 0  
Notional Amount of Derivative Instruments Added                 470,000    
Notional Amount of Derivative Instruments Maturing, Settled, Terminated, or Paired-Off                 (420,000)    
Not Designated as Hedging Instrument, Economic Hedge [Member] | Long [Member] | Interest rate swaps                      
Derivative [Line Items]                      
Derivative, Notional Amount 0       (100,000)       0 (100,000)  
Notional Amount of Derivative Instruments Added                 0    
Notional Amount of Derivative Instruments Maturing, Settled, Terminated, or Paired-Off                 (100,000)    
Not Designated as Hedging Instrument, Economic Hedge [Member] | Short [Member] | Interest rate swaps                      
Derivative [Line Items]                      
Derivative, Notional Amount (4,515,000)       (5,775,000)       (4,515,000) (5,775,000)  
Notional Amount of Derivative Instruments Added                 1,770,000    
Notional Amount of Derivative Instruments Maturing, Settled, Terminated, or Paired-Off                 (3,030,000)    
Not Designated as Hedging Instrument, Economic Hedge [Member] | Short [Member] | TBA securities                      
Derivative [Line Items]                      
Derivative liabilities, fair value 0       (269)       0 (269)  
Derivative, Notional Amount 0       (150,000) [5]       0 (150,000) [5]  
Notional Amount of Derivative Instruments Added                 0    
Notional Amount of Derivative Instruments Maturing, Settled, Terminated, or Paired-Off                 (150,000)    
Not Designated as Hedging Instrument, Trading | Options on U.S. Treasury futures                      
Derivative [Line Items]                      
Derivative, Notional Amount 0       0       0 0  
Notional Amount of Derivative Instruments Added                 800,000    
Notional Amount of Derivative Instruments Maturing, Settled, Terminated, or Paired-Off                 (800,000)    
Not Designated as Hedging Instrument, Trading | Long [Member] | TBA securities                      
Derivative [Line Items]                      
Derivative assets, fair value 6,239       1,483       6,239 1,483  
Derivative, Notional Amount [5] (860,000)       (795,000)       (860,000) (795,000)  
Notional Amount of Derivative Instruments Added                 9,689,000    
Notional Amount of Derivative Instruments Maturing, Settled, Terminated, or Paired-Off                 (9,624,000)    
Not Designated as Hedging Instrument, Trading | Short [Member] | U.S. Treasury futures                      
Derivative [Line Items]                      
Derivative liabilities, fair value (1,218)       0       (1,218) 0  
Maturity in three years or less | Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest rate swaps                      
Derivative [Line Items]                      
Derivative, Notional Amount [1] $ (1,560,000)       $ (3,320,000)       $ (1,560,000) $ (3,320,000)  
Derivative, Average Fixed Interest Rate 1.96%       1.35%       1.96% 1.35%  
Derivative, Average Remaining Maturity                 1 year 4 months 24 days 21 days  
Derivative, Fair Value, Net [3] $ 324       $ 791       $ 324 $ 791  
Maturity between 3 and 6 years | Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest rate swaps                      
Derivative [Line Items]                      
Derivative, Notional Amount [1] $ (1,230,000)       $ (1,210,000)       $ (1,230,000) $ (1,210,000)  
Derivative, Average Fixed Interest Rate 2.23%       2.00%       2.23% 2.00%  
Derivative, Average Remaining Maturity                 4 years 4 months 24 days 4 years 7 months 6 days  
Derivative, Fair Value, Net [3] $ 0       $ 0       $ 0 $ 0  
Maturity between 6 and 10 years | Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest rate swaps                      
Derivative [Line Items]                      
Derivative, Notional Amount [1] $ (1,505,000)       $ (1,025,000)       $ (1,505,000) $ (1,025,000)  
Derivative, Average Fixed Interest Rate 2.80%       2.49%       2.80% 2.49%  
Derivative, Average Remaining Maturity                 8 years 3 months 18 days 8 years  
Derivative, Fair Value, Net [3] $ 0       $ 0       $ 0 $ 0  
Maturity greater than 10 years [Member] | Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest rate swaps                      
Derivative [Line Items]                      
Derivative, Notional Amount [1] $ (220,000)       $ (120,000)       $ (220,000) $ (120,000)  
Derivative, Average Fixed Interest Rate 2.81%       2.75%       2.81% 2.75%  
Derivative, Average Remaining Maturity                 21 years 10 months 24 days 17 years 3 months 18 days  
Derivative, Fair Value, Net [3] $ 0       $ 0       $ 0 $ 0  
[1] The net notional amounts included in the tables above represent pay-fixed interest rate swaps, net of any receive-fixed interest rate swaps, and include $775,000 and $2,655,000 of pay-fixed forward starting interest rate swaps as of December 31, 2018 and December 31, 2017, respectively.
[2] Excluding forward starting pay-fixed interest rate swaps, the weighted average pay rate was 2.29% and 1.36% as of December 31, 2018 and December 31, 2017, respectively.
[3] The majority of the Company’s interest rate swap agreements are centrally cleared through the CME. Please refer to Note 1 for information regarding the exchange of variation margin being legally considered as settlement of the derivative as opposed to a pledge of collateral.
[4] The Eurodollar futures notional amounts represent the total notional of the 3-month contracts all of which expired in 2018. The maximum notional outstanding for any future 3-month period did not exceed $650,000 during the period indicated.
[5] Notional amount represents the par value (or principal balance) of the underlying Agency MBS as if settled as of the date indicated.