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Derivative Instruments Schedule of Gains and Losses on Derivative Instruments (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Derivative [Line Items] |  |
Net realized gains (losses) on periodic settements of interest rate swaps | $ 1,132 | $ (15)
Net realized gains (losses) other than on periodic settements of interest rate swaps | 14,823 | 1,668
Net realized gains (losses) on financial derivatives | 15,955 | 1,653
Change in net unrealized gains (losses) on accrued periodic settlements on interest rate swaps | (1,511) | (462)
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps | 2,076 | (1,680)
Change in net unrealized gains (losses) on financial derivatives | 565 | (2,142)
Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Net realized gains (losses) on periodic settements of interest rate swaps | 1,132 | (15)
Net realized gains (losses) other than on periodic settements of interest rate swaps | 2,441 | (29)
Net realized gains (losses) on financial derivatives | 3,573 | (44)
Change in net unrealized gains (losses) on accrued periodic settlements on interest rate swaps | (1,511) | (462)
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps | 6,098 | 756
Change in net unrealized gains (losses) on financial derivatives | 4,587 | 294
Swaption [Member] |  |
Derivative [Line Items] |  |
Net realized gains (losses) other than on periodic settements of interest rate swaps | 0 |
Net realized gains (losses) on financial derivatives | 0 |
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps | 205 |
Change in net unrealized gains (losses) on financial derivatives | 205 |
TBA securities [Member] |  |
Derivative [Line Items] |  |
Net realized gains (losses) other than on periodic settements of interest rate swaps | 11,303 | 1,831
Net realized gains (losses) on financial derivatives | 11,303 | 1,831
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps | (1,944) | (2,342)
Change in net unrealized gains (losses) on financial derivatives | (1,944) | (2,342)
Futures [Member] |  |
Derivative [Line Items] |  |
Net realized gains (losses) other than on periodic settements of interest rate swaps | 1,079 | (134)
Net realized gains (losses) on financial derivatives | 1,079 | (134)
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps | (2,283) | (94)
Change in net unrealized gains (losses) on financial derivatives | $ (2,283) | $ (94)

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- Definition Realized gains or (losses) on derivatives sold, terminated, or otherwise disposed of during the period. In addition, periodic payments or receipts on swaps are recorded as realized gains or losses. + References No definition available. + Details
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- Definition Unrealized gains (losses) on accrued periodic settlements on interest rate swaps. + References No definition available. + Details
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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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