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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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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

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