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Derivative Instruments Schedule of Gains and Losses on Derivative Instruments (Details) - USD ($) $ in Thousands	3 Months Ended
	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)

X

- 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

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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

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