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(Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Derivative [Line Items]      
Derivative assets, fair value $ 4,754   $ 2,940
Gain on derivative instruments, net $ 38,354 $ 175  
Derivative, Average Fixed Interest Rate, Current Effective 1.63%   1.36%
Other Footnotes Disclosing Derivative-Related Information, Cross-Reference Note 1    
Forward starting interest rate swap      
Derivative [Line Items]      
Derivative, Notional Amount $ 1,575,000   $ 2,525,000
Eurodollar futures      
Derivative [Line Items]      
Derivative Instruments Not Designated as Hedging Instruments, Gain 1,905 0  
Long [Member] | Interest rate swaps      
Derivative [Line Items]      
Derivative Instruments Not Designated as Hedging Instruments, Loss (1,129) (134)  
Long [Member] | TBA securities      
Derivative [Line Items]      
Derivative Instruments Not Designated as Hedging Instruments, Loss (12,087) 0  
Short [Member] | Interest rate swaps      
Derivative [Line Items]      
Derivative Instruments Not Designated as Hedging Instruments, Gain 49,372 309  
Short [Member] | TBA securities      
Derivative [Line Items]      
Derivative Instruments Not Designated as Hedging Instruments, Gain 293 $ 0  
Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest rate swaps      
Derivative [Line Items]      
Derivative assets, fair value 1,081   791
Derivative, Notional Amount [1] $ 4,650,000   $ 5,675,000
Derivative, Average Fixed Interest Rate [2] 1.89%   1.71%
Derivative, Average Remaining Maturity 4 years 6 months   3 years 1 month 6 days
Derivative, Fair Value, Net [3] $ 1,081   $ 791
Not Designated as Hedging Instrument, Economic Hedge [Member] | Eurodollar futures      
Derivative [Line Items]      
Derivative assets, fair value 1,674   666
Derivative, Notional Amount [4] 1,300,000   1,950,000
Not Designated as Hedging Instrument, Economic Hedge [Member] | Long [Member] | Interest rate swaps      
Derivative [Line Items]      
Derivative, Notional Amount 100,000   100,000
Not Designated as Hedging Instrument, Economic Hedge [Member] | Short [Member] | Interest rate swaps      
Derivative [Line Items]      
Derivative, Notional Amount 4,750,000   5,775,000
Not Designated as Hedging Instrument, Economic Hedge [Member] | Short [Member] | TBA securities      
Derivative [Line Items]      
Derivative liabilities, fair value 0   269
Derivative, Notional Amount [5] 0   150,000
Not Designated as Hedging Instrument, Trading [Member] | Long [Member] | TBA securities      
Derivative [Line Items]      
Derivative assets, fair value 1,999   1,483
Derivative, Notional Amount [5] 825,000   795,000
Maturity in three years or less | Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest rate swaps      
Derivative [Line Items]      
Derivative, Notional Amount [1] $ 2,020,000   $ 3,320,000
Derivative, Average Fixed Interest Rate 1.39%   1.35%
Derivative, Average Remaining Maturity 9 months 18 days   8 months 12 days
Derivative, Fair Value, Net [3] $ 1,081   $ 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] $ 1,310,000   $ 1,210,000
Derivative, Average Fixed Interest Rate 2.01%   2.00%
Derivative, Average Remaining Maturity 4 years 6 months   4 years 7 months 6 days
Derivative, Fair Value, Net [3] $ 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] $ 1,100,000   $ 1,025,000
Derivative, Average Fixed Interest Rate 2.56%   2.49%
Derivative, Average Remaining Maturity 8 years 2 months 12 days   8 years
Derivative, Fair Value, Net [3] $ 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
Derivative, Average Fixed Interest Rate 2.81%   2.75%
Derivative, Average Remaining Maturity 22 years 3 months 18 days   17 years 3 months 18 days
Derivative, Fair Value, Net [3] $ 0   $ 0
[1] The net notional amounts included in the tables above represent pay-fixed interest rate swaps, net of receive-fixed interest rate swaps and include $1,575,000 and $2,525,000 of pay-fixed forward starting interest rate swaps as of March 31, 2018 and December 31, 2017, respectively.
[2] Excluding forward starting pay-fixed interest rate swaps, the weighted average pay rate was 1.63% and 1.36% as of March 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 expire in 2018. The maximum notional outstanding for any future 3-month period did not exceed $650,000 as of March 31, 2018 or December 31, 2017.
[5] Notional amount represents the par value (or principal balance) of the underlying Agency MBS as if settled as of the end of the period.