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Derivative Instruments Schedule of TBA Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Derivative [Line Items] |  |  |
Financial derivatives–assets, at fair value | [1] | $ 1,635 | $ 2,183
Financial derivatives–liabilities, at fair value | [1] | (18,284) | (4,725)
Derivative, Fair Value, Net |  | (16,649) | (2,542)
TBA securities- purchase contracts [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative notional | [2] | 76,904 | 83,709
Derivative cost basis | [3] | 79,928 | 85,846
Market Value, Underyling | [4] | 80,293 | 85,912
Derivative, Fair Value, Net | [5] | 365 | 66
TBA securities- sale contracts [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative notional | [2] | (311,246) | (423,546)
Derivative cost basis | [3] | (332,743) | (450,449)
Market Value, Underyling | [4] | (333,900) | (450,462)
Derivative, Fair Value, Net | [5] | (1,157) | (13)
TBA securities [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative notional, net | [2] | (234,342) | (339,837)
Derivative cost basis | [3] | (252,815) | (364,603)
Market Value, Underyling | [4] | (253,607) | (364,550)
Derivative, Fair Value, Net | [5] | (792) | 53
Derivative Financial Instruments, Assets [Member] | TBA securities- purchase contracts [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative notional | [2] | 76,904 | 60,291
Derivative cost basis | [3] | 79,928 | 61,638
Market Value, Underyling | [4] | 80,293 | 61,753
Financial derivatives–assets, at fair value | [5] | 365 | 115
Derivative Financial Instruments, Assets [Member] | TBA securities- sale contracts [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative notional | [2] | 0 | (170,800)
Derivative cost basis | [3] | 0 | (181,476)
Market Value, Underyling | [4] | 0 | (181,174)
Financial derivatives–assets, at fair value | [5] | 0 | 302
Derivative Financial Instruments, Liabilities [Member] | TBA securities- purchase contracts [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative notional | [2] | 0 | 23,418
Derivative cost basis | [3] | 0 | 24,208
Market Value, Underyling | [4] | 0 | 24,159
Financial derivatives–liabilities, at fair value | [5] | 0 | (49)
Derivative Financial Instruments, Liabilities [Member] | TBA securities- sale contracts [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative notional | [2] | (311,246) | (252,746)
Derivative cost basis | [3] | (332,743) | (268,973)
Market Value, Underyling | [4] | (333,900) | (269,288)
Financial derivatives–liabilities, at fair value | [5] | $ (1,157) | $ (315)
[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.

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