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(Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Derivative [Line Items]      
Derivative assets, fair value $ 6,030   $ 6,563
Gain (loss) on derivative instruments, net $ (61,697) $ 38,354  
Derivative, Average Fixed Interest Rate, Current Effective 2.38%   2.29%
Forward starting interest rate swap      
Derivative [Line Items]      
Derivative, Notional Amount $ 0   $ (775,000)
Eurodollar futures      
Derivative [Line Items]      
Derivative Instruments Not Designated as Hedging Instruments, Gain 0 1,905  
U.S. Treasury futures      
Derivative [Line Items]      
Derivative Instruments Not Designated as Hedging Instruments, Gain   0  
Derivative Instruments Not Designated as Hedging Instruments, Loss (109)    
Long [Member] | Interest rate swaps      
Derivative [Line Items]      
Derivative Instruments Not Designated as Hedging Instruments, Loss 0 (1,129)  
Long [Member] | TBA securities      
Derivative [Line Items]      
Derivative Instruments Not Designated as Hedging Instruments, Gain 10,176    
Derivative Instruments Not Designated as Hedging Instruments, Loss   (12,087)  
Short [Member] | Interest rate swaps      
Derivative [Line Items]      
Derivative Instruments Not Designated as Hedging Instruments, Gain   49,372  
Derivative Instruments Not Designated as Hedging Instruments, Loss (71,764)    
Short [Member] | TBA securities      
Derivative [Line Items]      
Derivative Instruments Not Designated as Hedging Instruments, Gain 0 $ 293  
Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest rate swaps      
Derivative [Line Items]      
Derivative assets, fair value 112   324
Derivative, Notional Amount [1] $ (5,015,000)   $ (4,515,000)
Derivative, Average Fixed Interest Rate [2] 2.38%   2.35%
Derivative, Average Remaining Maturity 5 years 11 months 16 days 5 years 6 months 1 day  
Derivative, Fair Value, Net [3] $ 112   $ 324
Not Designated as Hedging Instrument, Economic Hedge [Member] | U.S. Treasury futures      
Derivative [Line Items]      
Derivative, Notional Amount 0   (50,000)
Notional Amount of Derivative Instruments Added 0    
Notional Amount of Derivative Instruments Maturing, Settled, Terminated, or Paired-Off (50,000)    
Not Designated as Hedging Instrument, Economic Hedge [Member] | Short [Member] | Interest rate swaps      
Derivative [Line Items]      
Derivative, Notional Amount (5,015,000)   (4,515,000)
Notional Amount of Derivative Instruments Added 1,500,000    
Notional Amount of Derivative Instruments Maturing, Settled, Terminated, or Paired-Off (1,000,000)    
Not Designated as Hedging Instrument, Trading | Long [Member] | TBA securities      
Derivative [Line Items]      
Derivative assets, fair value 5,918   6,239
Derivative, Notional Amount (715,000)   (860,000)
Notional Amount of Derivative Instruments Added 2,720,000    
Notional Amount of Derivative Instruments Maturing, Settled, Terminated, or Paired-Off (2,865,000)    
Not Designated as Hedging Instrument, Trading | Short [Member] | U.S. Treasury futures      
Derivative [Line Items]      
Derivative liabilities, fair value 0   (1,218)
Maturity in three years or less | Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest rate swaps      
Derivative [Line Items]      
Derivative, Notional Amount [1] $ (1,435,000)   $ (1,560,000)
Derivative, Average Fixed Interest Rate 2.01%   1.96%
Derivative, Average Remaining Maturity 1 year 3 months 1 year 4 months 18 days  
Derivative, Fair Value, Net [3] $ 112   $ 324
Maturity between 3 and 6 years | Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest rate swaps      
Derivative [Line Items]      
Derivative, Notional Amount [1] $ (1,930,000)   $ (1,230,000)
Derivative, Average Fixed Interest Rate 2.27%   2.23%
Derivative, Average Remaining Maturity 5 years 8 months 1 day 4 years 4 months 17 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] $ (1,530,000)   $ (1,505,000)
Derivative, Average Fixed Interest Rate 2.85%   2.80%
Derivative, Average Remaining Maturity 8 years 11 months 16 days 8 years 3 months 16 days  
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] $ (120,000)   $ (220,000)
Derivative, Average Fixed Interest Rate 2.84%   2.81%
Derivative, Average Remaining Maturity 28 years 5 months 1 day 21 years 10 months 29 days  
Derivative, Fair Value, Net [3] $ 0   $ 0
[1] The notional amounts include $0 and $775,000 of forward starting pay-fixed interest rate swaps as of March 31, 2019 and December 31, 2018, respectively.
[2] Excluding forward starting pay-fixed interest rate swaps, the weighted average pay rate was 2.38% and 2.29% as of March 31, 2019 and December 31, 2018, 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.