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Derivative Instruments Schedule of TBA Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Derivative [Line Items]    
Financial derivatives–assets, at fair value [1] $ 23,049 $ 8,792
Financial derivatives–liabilities, at fair value [1] (333) (1,863)
Derivative, Fair Value, Net 22,716 6,929
TBA securities- purchase contracts [Member]    
Derivative [Line Items]    
Derivative notional [2] 128,029 113,144
Derivative cost basis [3] 129,579 117,635
Market Value, Underyling [4] 129,317 117,395
Derivative, Fair Value, Net [5] (262) (240)
TBA securities- sale contracts [Member]    
Derivative [Line Items]    
Derivative notional [2] (352,948) (686,855)
Derivative cost basis [3] (354,476) (713,353)
Market Value, Underyling [4] (353,087) (713,446)
Derivative, Fair Value, Net [5] 1,389 (93)
TBA securities [Member]    
Derivative [Line Items]    
Derivative notional, net [2] (224,919) (573,711)
Derivative cost basis [3] (224,897) (595,718)
Market Value, Underyling [4] (223,770) (596,051)
Derivative, Fair Value, Net [5] 1,127 (333)
Derivative Financial Instruments, Assets [Member] | TBA securities- purchase contracts [Member]    
Derivative [Line Items]    
Derivative notional [2] 16,800 37,355
Derivative cost basis [3] 16,503 38,065
Market Value, Underyling [4] 16,536 38,091
Financial derivatives–assets, at fair value [5] 33 26
Derivative Financial Instruments, Assets [Member] | TBA securities- sale contracts [Member]    
Derivative [Line Items]    
Derivative notional [2] (343,137) (358,279)
Derivative cost basis [3] (344,620) (372,219)
Market Value, Underyling [4] (343,206) (371,843)
Financial derivatives–assets, at fair value [5] 1,414 376
Derivative Financial Instruments, Liabilities [Member] | TBA securities- purchase contracts [Member]    
Derivative [Line Items]    
Derivative notional [2] 111,229 75,789
Derivative cost basis [3] 113,076 79,570
Market Value, Underyling [4] 112,781 79,304
Financial derivatives–liabilities, at fair value [5] (295) (266)
Derivative Financial Instruments, Liabilities [Member] | TBA securities- sale contracts [Member]    
Derivative [Line Items]    
Derivative notional [2] (9,811) (328,576)
Derivative cost basis [3] (9,856) (341,134)
Market Value, Underyling [4] (9,881) (341,603)
Financial derivatives–liabilities, at fair value [5] $ (25) $ (469)
[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 (received) 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.