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Derivative Instruments Schedule of Gains and Losses on Derivative Instruments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Derivative [Line Items] |  |  |  |  |
Net realized gains (losses) on periodic settements of interest rate swaps | $ 1,281 | $ 957 | $ 1,072 | $ 7 |
Net realized gains (losses) other than on periodic settements of interest rate swaps | 2,777 | (3,938) | 15,239 | (10,462) |
Net realized gains (losses) on financial derivatives | 4,058 | (2,981) | 16,311 | (10,455) | [1]
Change in net unrealized gains (losses) on accrued periodic settlements on interest rate swaps | (893) | (1,657) | (932) | (1,801) |
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps | 5,499 | 968 | 16,937 | 499 |
Change in net unrealized gains (losses) on financial derivatives | 4,606 | (689) | 16,005 | (1,302) | [1]
Interest Rate Swap [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Net realized gains (losses) on periodic settements of interest rate swaps | 1,281 | 957 | 1,072 | 7 |
Net realized gains (losses) other than on periodic settements of interest rate swaps | 2,096 | (76) | 5,065 | (71) |
Net realized gains (losses) on financial derivatives | 3,377 | 881 | 6,137 | (64) |
Change in net unrealized gains (losses) on accrued periodic settlements on interest rate swaps | (893) | (1,657) | (932) | (1,801) |
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps | 2,383 | 808 | 12,167 | (870) |
Change in net unrealized gains (losses) on financial derivatives | 1,490 | (849) | 11,235 | (2,671) |
Swaption [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Net realized gains (losses) other than on periodic settements of interest rate swaps | (249) | 0 | (249) | 0 |
Net realized gains (losses) on financial derivatives | (249) | 0 | (249) | 0 |
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps | (221) | (37) | 68 | (37) |
Change in net unrealized gains (losses) on financial derivatives | (221) | (37) | 68 | (37) |
TBA securities [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Net realized gains (losses) other than on periodic settements of interest rate swaps | (692) | (3,475) | 10,151 | (9,363) |
Net realized gains (losses) on financial derivatives | (692) | (3,475) | 10,151 | (9,363) |
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps | 2,100 | (179) | 1,460 | 936 |
Change in net unrealized gains (losses) on financial derivatives | 2,100 | (179) | 1,460 | 936 |
Futures [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Net realized gains (losses) other than on periodic settements of interest rate swaps | 1,622 | (387) | 272 | (1,028) |
Net realized gains (losses) on financial derivatives | 1,622 | (387) | 272 | (1,028) |
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps | 1,237 | 376 | 3,242 | 470 |
Change in net unrealized gains (losses) on financial derivatives | $ 1,237 | $ 376 | $ 3,242 | $ 470 |
[1] | Conformed to current period presentation.

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