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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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- 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.

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Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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-Section 50
-Paragraph 1A
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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.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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