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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.

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