Derivative Instruments Schedule of TBA Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Derivative [Line Items]    
Financial derivatives–assets, at fair value [1] $ 2,183 $ 3,072
Financial derivatives–liabilities, at fair value [1] (4,725) (8,700)
Derivative, Fair Value, Net (2,542) (5,628)
TBA securities- purchase contracts [Member]    
Derivative [Line Items]    
Derivative notional [2] 83,709 68,319
Derivative cost basis [3] 85,846 70,360
Market Value, Underyling [4] 85,912 70,742
Derivative, Fair Value, Net [5] 66 382
TBA securities- sale contracts [Member]    
Derivative [Line Items]    
Derivative notional [2] (423,546) (605,076)
Derivative cost basis [3] (450,449) (644,949)
Market Value, Underyling [4] (450,462) (646,529)
Derivative, Fair Value, Net [5] (13) (1,580)
TBA securities [Member]    
Derivative [Line Items]    
Derivative notional, net [2] (339,837) (536,757)
Derivative cost basis [3] (364,603) (574,589)
Market Value, Underyling [4] (364,550) (575,787)
Derivative, Fair Value, Net [5] 53 (1,198)
Derivative Financial Instruments, Assets [Member] | TBA securities- purchase contracts [Member]    
Derivative [Line Items]    
Derivative notional [2] 60,291 53,319
Derivative cost basis [3] 61,638 54,757
Market Value, Underyling [4] 61,753 55,144
Financial derivatives–assets, at fair value [5] 115 387
Derivative Financial Instruments, Assets [Member] | TBA securities- sale contracts [Member]    
Derivative [Line Items]    
Derivative notional [2] (170,800) (79,090)
Derivative cost basis [3] (181,476) (85,730)
Market Value, Underyling [4] (181,174) (85,641)
Financial derivatives–assets, at fair value [5] 302 89
Derivative Financial Instruments, Liabilities [Member] | TBA securities- purchase contracts [Member]    
Derivative [Line Items]    
Derivative notional [2] 23,418 15,000
Derivative cost basis [3] 24,208 15,603
Market Value, Underyling [4] 24,159 15,598
Financial derivatives–liabilities, at fair value [5] (49) (5)
Derivative Financial Instruments, Liabilities [Member] | TBA securities- sale contracts [Member]    
Derivative [Line Items]    
Derivative notional [2] (252,746) (525,986)
Derivative cost basis [3] (268,973) (559,219)
Market Value, Underyling [4] (269,288) (560,888)
Financial derivatives–liabilities, at fair value [5] $ (315) $ (1,669)
[1] In the Company's Consolidated Balance Sheet, all balances associated with the repurchase agreements and financial derivatives are presented on a gross basis.
[2] Notional amount represents the principal balance of the underlying Agency RMBS.
[3] Cost basis represents the forward price to be paid for the underlying Agency RMBS.
[4] Market value represents the current market value of the underlying Agency RMBS (on a forward delivery basis) as of period end.
[5] Net carrying value represents the difference between the market value of the TBA contract as of period end and the cost basis and is reported in Financial derivatives-assets at fair value and Financial derivatives-liabilities at fair value on the Consolidated Balance Sheet.