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Derivative Instruments Schedule of Gains and Losses on Derivative Instruments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Derivative [Line Items]
Net realized gains (losses) on periodic settements of interest rate swaps	$ (672)	$ (707)
Net realized gains (losses) other than on periodic settements of interest rate swaps	(3,324)	(8,036)
Net realized gains (losses) on financial derivatives	(3,996)	(8,743)
Change in net unrealized gains (losses) on accrued periodic settlements on interest rate swaps	(726)	(851)
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	(13,409)	(6,243)
Change in net unrealized gains (losses) on financial derivatives	(14,135)	(7,094)
Interest Rate Swap [Member]
Derivative [Line Items]
Net realized gains (losses) on periodic settements of interest rate swaps	(672)	(707)
Net realized gains (losses) other than on periodic settements of interest rate swaps	(1,226)	(3,441)
Net realized gains (losses) on financial derivatives	(1,898)	(4,148)
Change in net unrealized gains (losses) on accrued periodic settlements on interest rate swaps	(726)	(851)
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	(12,543)	(6,383)
Change in net unrealized gains (losses) on financial derivatives	(13,269)	(7,234)
Interest Rate 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		237
Change in net unrealized gains (losses) on financial derivatives		237
TBA securities [Member]
Derivative [Line Items]
Net realized gains (losses) other than on periodic settements of interest rate swaps	(2,099)	(4,595)
Net realized gains (losses) on financial derivatives	(2,099)	(4,595)
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	(844)	(97)
Change in net unrealized gains (losses) on financial derivatives	(844)	$ (97)
Futures [Member]
Derivative [Line Items]
Net realized gains (losses) other than on periodic settements of interest rate swaps	1
Net realized gains (losses) on financial derivatives	1
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	(22)
Change in net unrealized gains (losses) on financial derivatives	$ (22)

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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Unrealized gains (losses) on other than accrued periodic settlements on interest rate swaps.

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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=56944662&loc=d3e3602-108585

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