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Derivative Instruments Schedule of TBA Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Derivative [Line Items] |  |
Financial derivatives–assets, at fair value | $ 1,732 | $ 4,180
Financial derivatives–liabilities, at fair value | (20,234) | (2,047)
Derivative, Fair Value, Net | (18,502) | 2,133
TBA securities- purchase contracts [Member] |  |
Derivative [Line Items] |  |
Derivative notional | 53,800 | 70,447
Derivative cost basis | 55,283 | 72,716
Market Value, Underyling | 55,938 | 72,693
Derivative, Fair Value, Net | 655 | (23)
TBA securities- sale contracts [Member] |  |
Derivative [Line Items] |  |
Derivative notional | (303,388) | (246,955)
Derivative cost basis | (319,019) | (255,903)
Market Value, Underyling | (322,474) | (256,062)
Derivative, Fair Value, Net | (3,455) | (159)
TBA securities [Member] |  |
Derivative [Line Items] |  |
Derivative notional, net | (249,588) | (176,508)
Derivative cost basis | (263,736) | (183,187)
Market Value, Underyling | (266,536) | (183,369)
Derivative, Fair Value, Net | (2,800) | (182)
Derivative Financial Instruments, Assets [Member] | TBA securities- purchase contracts [Member] |  |
Derivative [Line Items] |  |
Derivative notional | 53,800 | 26,877
Derivative cost basis | 55,283 | 27,087
Market Value, Underyling | 55,938 | 27,135
Financial derivatives–assets, at fair value | 655 | 48
Derivative Financial Instruments, Assets [Member] | TBA securities- sale contracts [Member] |  |
Derivative [Line Items] |  |
Derivative notional | (22,333) | (82,520)
Derivative cost basis | (23,729) | (85,124)
Market Value, Underyling | (23,602) | (85,050)
Financial derivatives–assets, at fair value | 127 | 74
Derivative Financial Instruments, Liabilities [Member] | TBA securities- purchase contracts [Member] |  |
Derivative [Line Items] |  |
Derivative notional | 0 | 43,570
Derivative cost basis | 0 | 45,629
Market Value, Underyling | 0 | 45,558
Financial derivatives–liabilities, at fair value | 0 | (71)
Derivative Financial Instruments, Liabilities [Member] | TBA securities- sale contracts [Member] |  |
Derivative [Line Items] |  |
Derivative notional | (281,055) | (164,435)
Derivative cost basis | (295,290) | (170,779)
Market Value, Underyling | (298,872) | (171,012)
Financial derivatives–liabilities, at fair value | $ (3,582) | $ (233)

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