Quarterly report pursuant to Section 13 or 15(d)

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

v3.4.0.3
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments $ (125,484) $ (126,443)
Derivative Instruments, Gain (Loss) Recognized in Income, Net 16,015 2,967
Gain (Loss) on Mortgage Loans Held-for-Sale 10,803 9,092
Trading Activity, Gains and Losses, Net (108,071) (122,506)
Inverse Interest-Only Securities [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Instruments, Gain (Loss) Recognized in Income, Net 12,982 19,261
Loan Purchase Commitments [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) on Mortgage Loans Held-for-Sale 1,398 970
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 25,329 (27,958)
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 (981) 2,535
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 6,090
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 (16,255) (18,506)
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 (21,724) 3,132
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 112,674 42,326
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 (81,084) (52,559)
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 (140,819) (97,704)
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 $ 409 $ (93)