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(Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Derivative [Line Items]                      
Derivative assets, fair value $ 2,940       $ 28,534       $ 2,940 $ 28,534  
Derivative liabilities, fair value (269)       (6,922)       (269) (6,922)  
Derivative asset, net of variation margin         104         104  
Derivative liability, net of variation margin         (576)         (576)  
Gain (loss) on derivative instruments, net $ 12,678 $ 5,993 $ (15,802) $ 175 $ 56,546 $ 2,409 $ (16,297) $ (48,264) $ 3,044 $ (5,606) $ (43,128)
Derivative, Average Fixed Interest Rate, Current Effective 1.36%       0.73%       1.36% 0.73%  
Other Footnotes Disclosing Derivative-Related Information, Cross-Reference                 Please refer to Note 1 for information related to the Company’s accounting policy for its derivative instruments.    
Forward starting interest rate swap                      
Derivative [Line Items]                      
Derivative, Notional Amount $ (2,525,000)       $ (2,725,000)       $ (2,525,000) $ (2,725,000)  
Eurodollar futures                      
Derivative [Line Items]                      
Derivative Instruments Not Designated as Hedging Instruments, Gain                 (821)    
Derivative Instruments Not Designated as Hedging Instruments, Loss                   (4,815) (20,963)
Long [Member] | Interest rate swaps                      
Derivative [Line Items]                      
Derivative Instruments Not Designated as Hedging Instruments, Gain                 (23) (2,515) (6,522)
Long [Member] | TBA securities                      
Derivative [Line Items]                      
Derivative assets, fair value         0         0  
Derivative Instruments Not Designated as Hedging Instruments, Gain                 (5,757) 0 0
Short [Member] | Interest rate swaps                      
Derivative [Line Items]                      
Derivative Instruments Not Designated as Hedging Instruments, Loss                 (2,655) (3,306) (28,687)
Short [Member] | TBA securities                      
Derivative [Line Items]                      
Derivative Instruments Not Designated as Hedging Instruments, Gain                   0 $ 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 [1] 791       28,534       791 28,534  
Derivative liabilities, fair value [1] 0       (6,922)       0 (6,922)  
Derivative, Notional Amount [2] $ (5,675,000)       $ (3,030,000)       $ (5,675,000) $ (3,030,000)  
Derivative, Average Fixed Interest Rate [3] 1.71%       1.58%       1.71% 1.58%  
Derivative, Average Remaining Maturity                 3 years 1 month 6 days 5 years 3 months 18 days  
Derivative, Fair Value, Net $ 791       $ 21,612       $ 791 $ 21,612  
Not Designated as Hedging Instrument, Economic Hedge [Member] | Eurodollar futures                      
Derivative [Line Items]                      
Derivative assets, fair value 666 [1]       0       666 [1] 0  
Derivative, Notional Amount (1,950,000)       0       (1,950,000) 0  
Notional Amount of Derivative Instruments Added                 2,600,000    
Notional Amount of Derivative Instruments Maturing, Settled, Terminated, or Paired-Off                 650,000    
Not Designated as Hedging Instrument, Economic Hedge [Member] | Long [Member] | Interest rate swaps                      
Derivative [Line Items]                      
Derivative, Notional Amount (100,000)       (425,000)       (100,000) (425,000)  
Notional Amount of Derivative Instruments Added                 0    
Notional Amount of Derivative Instruments Maturing, Settled, Terminated, or Paired-Off                 325,000    
Not Designated as Hedging Instrument, Economic Hedge [Member] | Short [Member] | Interest rate swaps                      
Derivative [Line Items]                      
Derivative, Notional Amount (5,775,000)       (3,455,000)       (5,775,000) (3,455,000)  
Notional Amount of Derivative Instruments Added                 3,890,000    
Notional Amount of Derivative Instruments Maturing, Settled, Terminated, or Paired-Off                 1,570,000    
Not Designated as Hedging Instrument, Economic Hedge [Member] | Short [Member] | TBA securities                      
Derivative [Line Items]                      
Derivative liabilities, fair value (269)       0       (269) 0  
Derivative, Notional Amount (150,000) [4]       0       (150,000) [4] 0  
Notional Amount of Derivative Instruments Added                 250,000    
Notional Amount of Derivative Instruments Maturing, Settled, Terminated, or Paired-Off                 100,000    
Not Designated as Hedging Instrument, Trading [Member] | Long [Member] | TBA securities                      
Derivative [Line Items]                      
Derivative assets, fair value 1,483               1,483    
Derivative, Notional Amount (795,000) [4]       0       (795,000) [4] 0  
Notional Amount of Derivative Instruments Added                 6,729,000    
Notional Amount of Derivative Instruments Maturing, Settled, Terminated, or Paired-Off                 5,934,000    
Maturity in three years or less | Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest rate swaps                      
Derivative [Line Items]                      
Derivative, Notional Amount [2] $ (3,320,000)       $ (595,000)       $ (3,320,000) $ (595,000)  
Derivative, Average Fixed Interest Rate 1.35%       0.73%       1.35% 0.73%  
Derivative, Average Remaining Maturity                 8 months 12 days 2 years 3 months 18 days  
Derivative, Fair Value, Net $ 791       $ 4,348       $ 791 $ 4,348  
Maturity between 3 and 6 years | Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest rate swaps                      
Derivative [Line Items]                      
Derivative, Notional Amount [2] $ (1,210,000)       $ (1,185,000)       $ (1,210,000) $ (1,185,000)  
Derivative, Average Fixed Interest Rate 2.00%       1.47%       2.00% 1.47%  
Derivative, Average Remaining Maturity                 4 years 7 months 6 days 4 years 3 months 18 days  
Derivative, Fair Value, Net $ 0       $ 8,631       $ 0 $ 8,631  
Maturity between 6 and 10 years | Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest rate swaps                      
Derivative [Line Items]                      
Derivative, Notional Amount [2] $ (1,025,000)       $ (1,250,000)       $ (1,025,000) $ (1,250,000)  
Derivative, Average Fixed Interest Rate 2.49%       2.42%       2.49% 2.42%  
Derivative, Average Remaining Maturity                 8 years 8 years 10 months 24 days  
Derivative, Fair Value, Net $ 0       $ 8,633       $ 0 $ 8,633  
Maturity greater than 10 years [Member] | Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest rate swaps                      
Derivative [Line Items]                      
Derivative, Notional Amount [2] $ (120,000)               $ (120,000)    
Derivative, Average Fixed Interest Rate 2.75%               2.75%    
Derivative, Average Remaining Maturity                 17 years 3 months 18 days    
Derivative, Fair Value, Net $ 0               $ 0    
[1] Refer to Note 1 regarding information on a change in the CME rulebook. Amounts reported on the consolidated balance sheet as of December 31, 2017 for its interest rate swaps reflect the netting of the derivative asset or liability with the related collateral received or posted, respectively. The net amounts comparable to December 31, 2017 for the derivative asset and derivative liabilities as of December 31, 2016 were $104 and $(576), respectively.
[2] The net notional amounts included in the tables above represent pay-fixed interest rate swaps, net of receive-fixed interest rate swaps and include $2,525,000 and $2,725,000 of pay-fixed forward starting interest rate swaps as of December 31, 2017 and December 31, 2016, respectively.
[3] Excluding forward starting pay-fixed interest rate swaps, the weighted average pay rate was 1.36% and 0.73% as of December 31, 2017 and December 31, 2016, respectively.
[4] Notional amount represents the par value (or principal balance) of the underlying Agency MBS as if settled as of the end of the period.