Financial Derivatives (Schedule of Gains and Losses on Derivative Contracts) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Derivative [Line Items]
Net Realized Gains (Losses) on Periodic Settlements of Interest Rate Swaps	$ (1,069)	$ (1,150)	$ (1,808)	$ (1,900)
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	(713)	(485)	6,264	(23,790)
Realized gains (losses) on financial derivatives, net	(1,782)	(1,635)	4,456	(25,690)
Change in Net Unrealized Gains (Losses) on Accrued Periodic Settlements of Interest Rate Swaps	252	516	(47)	541
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	896	(794)	6,192	(2,611)
Unrealized gains (losses) on financial derivatives, net	1,148	(278)	6,145	(2,070)
Derivative [Member]
Derivative [Line Items]
Foreign currency transactions		(15)	18	12
Foreign currency translation	(7)	20	(38)	39
Interest rate swaps \| Interest Rate Risk [Member]
Derivative [Line Items]
Net Realized Gains (Losses) on Periodic Settlements of Interest Rate Swaps	(1,069)	(1,150)	(1,808)	(1,900)
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	(243)	(29)	(96)	(8,761)
Realized gains (losses) on financial derivatives, net	(1,312)	(1,179)	(1,904)	(10,661)
Change in Net Unrealized Gains (Losses) on Accrued Periodic Settlements of Interest Rate Swaps	252	516	(47)	541
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	2,790	1,104	6,244	(16,373)
Unrealized gains (losses) on financial derivatives, net	3,042	1,620	6,197	(15,832)
Credit default swaps on asset-backed securities \| Credit Risk [Member]
Derivative [Line Items]
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	(4)	1	39	(955)
Realized gains (losses) on financial derivatives, net	(4)	1	39	(955)
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	0	(1)	(44)	915
Unrealized gains (losses) on financial derivatives, net	0	(1)	(44)	915
Credit default swaps on corporate bond indices \| Credit Risk [Member]
Derivative [Line Items]
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	(136)	(239)	1,062	3,660
Realized gains (losses) on financial derivatives, net	(136)	(239)	1,062	3,660
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	69	503	(1,109)	7,642
Unrealized gains (losses) on financial derivatives, net	69	503	(1,109)	7,642
Credit default swaps on corporate bond indices \| Credit Risk [Member]
Derivative [Line Items]
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	(264)	(1,067)	(351)	(550)
Realized gains (losses) on financial derivatives, net	(264)	(1,067)	(351)	(550)
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	244	(1,059)	(647)	3,080
Unrealized gains (losses) on financial derivatives, net	244	(1,059)	(647)	3,080
Credit default swaps on corporate bonds \| Credit Risk [Member]
Derivative [Line Items]
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	184	(93)	265	356
Realized gains (losses) on financial derivatives, net	184	(93)	265	356
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	(192)	(334)	(346)	711
Unrealized gains (losses) on financial derivatives, net	(192)	(334)	(346)	711
Total return swaps \| Credit Risk [Member]
Derivative [Line Items]
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	(41)	(125)	(1,243)	(2,180)
Realized gains (losses) on financial derivatives, net	(41)	(125)	(1,243)	(2,180)
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	(465)	(348)	476	607
Unrealized gains (losses) on financial derivatives, net	(465)	(348)	476	607
TBA securities \| Interest Rate Risk [Member]
Derivative [Line Items]
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	(425)	2,367	4,536	(6,778)
Realized gains (losses) on financial derivatives, net	(425)	2,367	4,536	(6,778)
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	(2,381)	(744)	(720)	1,280
Unrealized gains (losses) on financial derivatives, net	(2,381)	(744)	(720)	1,280
Futures \| Interest Rate Risk [Member]
Derivative [Line Items]
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	(271)	(402)	1,641	(7,866)
Realized gains (losses) on financial derivatives, net	(271)	(402)	1,641	(7,866)
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	843	52	1,721	(434)
Unrealized gains (losses) on financial derivatives, net	843	52	1,721	(434)
Forwards \| Currency risk [Member]
Derivative [Line Items]
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	487	(898)	411	(616)
Realized gains (losses) on financial derivatives, net	487	(898)	411	(616)
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	(85)	33	640	343
Unrealized gains (losses) on financial derivatives, net	(85)	$ 33	640	343
Warrants \| Equity Market/Credit Risk [Member]
Derivative [Line Items]
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	0		0	0
Realized gains (losses) on financial derivatives, net	0		0	0
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	221		187	(382)
Unrealized gains (losses) on financial derivatives, net	221		187	(382)
Options \| Interest Rate Risk [Member]
Derivative [Line Items]
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps				(100)
Realized gains (losses) on financial derivatives, net				(100)
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps				0
Unrealized gains (losses) on financial derivatives, net				$ 0
Put Option [Member] \| Interest Rate Risk [Member]
Derivative [Line Items]
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	0
Realized gains (losses) on financial derivatives, net	0
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	(148)
Unrealized gains (losses) on financial derivatives, net	$ (148)
Put Option [Member] \| Credit Risk [Member]
Derivative [Line Items]
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps			0
Realized gains (losses) on financial derivatives, net			0
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps			(210)
Unrealized gains (losses) on financial derivatives, net			$ (210)

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Change in Net Unrealized Gains (Losses) on Accrued Periodic Settlements of Interest Rate Swaps

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Net Realized Gain/Loss on Derivatives including gain (loss) on foreign currency transactions

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