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Derivative Instruments Schedule of Gains and Losses on Derivative Instruments (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Derivative [Line Items] |  |  |
Net realized gains (losses) on periodic settements of interest rate swaps | $ 1,333 | $ 1,014 |
Net realized gains (losses) other than on periodic settements of interest rate swaps | (7,832) | (13,105) |
Net realized gains (losses) on financial derivatives | (6,499) | (12,091) |
Change in net unrealized gains (losses) on accrued periodic settlements on interest rate swaps | (1,149) | (334) |
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps | (19,451) | (634) |
Change in net unrealized gains (losses) on financial derivatives | (20,600) | (968) |
Interest Rate Swap [Member] |  |  |
Derivative [Line Items] |  |  |
Net realized gains (losses) on periodic settements of interest rate swaps | 1,333 | 1,014 |
Net realized gains (losses) other than on periodic settements of interest rate swaps | (4,584) | (1,969) |
Net realized gains (losses) on financial derivatives | (3,251) | (955) |
Change in net unrealized gains (losses) on accrued periodic settlements on interest rate swaps | (1,149) | (334) |
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps | (13,127) | (5,526) |
Change in net unrealized gains (losses) on financial derivatives | (14,276) | (5,860) |
TBA securities [Member] |  |  |
Derivative [Line Items] |  |  |
Net realized gains (losses) other than on periodic settements of interest rate swaps | (800) | (2,670) |
Net realized gains (losses) on financial derivatives | (800) | (2,670) |
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps | (2,618) | 325 |
Change in net unrealized gains (losses) on financial derivatives | (2,618) | 325 |
Futures [Member] |  |  |
Derivative [Line Items] |  |  |
Net realized gains (losses) other than on periodic settements of interest rate swaps | (2,448) | (8,366) |
Net realized gains (losses) on financial derivatives | (2,448) | (8,366) |
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps | (3,706) | 4,567 |
Change in net unrealized gains (losses) on financial derivatives | (3,706) | 4,567 |
Options Held [Member] |  |  |
Derivative [Line Items] |  |  |
Net realized gains (losses) other than on periodic settements of interest rate swaps |  | (100) |
Net realized gains (losses) on financial derivatives |  | (100) |
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps |  | 0 |
Change in net unrealized gains (losses) on financial derivatives |  | $ 0 |
Short [Member] | Interest Rate Swap [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount | 391,702 |  | $ 610,997
Short [Member] | Futures [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount | $ 80,200 |  | $ 33,400

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