Quarterly report pursuant to Section 13 or 15(d)

Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance (Details)

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Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments $ (171,656) $ 28,519 $ (253,147) $ (193,028)
Derivative Instruments, Gain (Loss) Recognized in Income, Net (455) 6,056 (2,972) (12,345)
Gain (Loss) on Mortgage Loans Held-for-Sale 16,040 (2,387) 18,300 6,233
Trading Activity, Gains and Losses, Net (169,277) 33,129 (257,446) (203,073)
Agency To-be-Announced Securities, Non-Risk Management [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Income, Net 0 0 0 (4,701)
Inverse Interest-Only Securities [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Income, Net 9,926 7,567 34,096 41,942
Forward Purchase Commitments [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) on Mortgage Loans Held-for-Sale 2,834 (1,446) (1,327) 2,300
Interest Rate Risk Associated with the Investment Portfolio [Member] | Forward Contracts [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Income, Net (2,982) 1,031 (25,677) (46,749)
Interest Rate Risk Associated with the Investment Portfolio [Member] | Short US Treasury Securities [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Income, Net 0 0 125 (8)
Interest Rate Risk Associated with the Investment Portfolio [Member] | Options Held [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Income, Net (1,358) (3,825) 6,848 (10,144)
Interest Rate Risk Associated with the Investment Portfolio [Member] | Treasury Lock [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Income, Net 0 0 (837) 0
Interest Rate Risk Associated with the Investment Portfolio [Member] | Swap [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Income, Net 0 1,306 6,164 6,734
Interest Rate Risk Associated with the Investment Portfolio [Member] | Interest Rate Swaption [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments (66,809) (22,827) (65,563) (192,635)
Interest Rate Risk Associated with the Investment Portfolio [Member] | Total Return Swap [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Income, Net (5,966) 48 (23,492) (1,324)
Interest Rate Risk Associated with the Investment Portfolio [Member] | Short [Member] | Interest Rate Swap [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments 86,672 (2,749) 86,528 104,193
Interest Rate Risk Associated with the Investment Portfolio [Member] | Long [Member] | Interest Rate Swap [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments (70,546) 21,288 (102,392) (38,473)
Interest Rate Risk Associated with Borrowings [Member] | Long [Member] | Interest Rate Swap [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments (120,973) 32,807 (171,720) (66,113)
Credit Risk Associated with Non-Agency RMBS and Mortgage Loans Held-for-Sale [Member] | Credit Default Swap, Selling Protection [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Income, Net $ (75) $ (71) $ (199) $ 1,905