Financial Derivatives (Schedule of Gains and Losses on Derivative Contracts) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Derivative [Line Items]
Net Realized Gains (Losses) on Periodic Settlements of Interest Rate Swaps	$ 2,841	$ (1,069)	$ 640	$ (1,808)
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	16,154	(713)	88,468	6,264
Realized gains (losses) on financial derivatives, net	18,995	(1,782)	89,108	4,456
Change in Net Unrealized Gains (Losses) on Accrued Periodic Settlements of Interest Rate Swaps	361	252	1,759	(47)
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	49,880	896	96,280	6,192
Unrealized gains (losses) on financial derivatives, net	50,241	1,148	98,039	6,145
Derivative [Member]
Derivative [Line Items]
Foreign currency transactions				18
Foreign currency translation	(18)	(7)	(43)	(38)
Interest rate swaps \| Interest Rate Risk [Member]
Derivative [Line Items]
Net Realized Gains (Losses) on Periodic Settlements of Interest Rate Swaps	2,841	(1,069)	640	(1,808)
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	5,442	(243)	15,514	(96)
Realized gains (losses) on financial derivatives, net	8,283	(1,312)	16,154	(1,904)
Change in Net Unrealized Gains (Losses) on Accrued Periodic Settlements of Interest Rate Swaps	361	252	1,759	(47)
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	22,845	2,790	62,879	6,244
Unrealized gains (losses) on financial derivatives, net	23,206	3,042	64,638	6,197
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	(844)	(4)	(854)	39
Realized gains (losses) on financial derivatives, net	(844)	(4)	(854)	39
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	717	0	615	(44)
Unrealized gains (losses) on financial derivatives, net	717	0	615	(44)
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	375	(136)	40	1,062
Realized gains (losses) on financial derivatives, net	375	(136)	40	1,062
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	(514)	69	1,190	(1,109)
Unrealized gains (losses) on financial derivatives, net	(514)	69	1,190	(1,109)
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	811	(264)	1,048	(351)
Realized gains (losses) on financial derivatives, net	811	(264)	1,048	(351)
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	(1,281)	244	2,376	(647)
Unrealized gains (losses) on financial derivatives, net	(1,281)	244	2,376	(647)
Credit default swaps on corporate bonds \| Credit Risk [Member]
Derivative [Line Items]
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	(57)	184	(76)	265
Realized gains (losses) on financial derivatives, net	(57)	184	(76)	265
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	(18)	(192)	89	(346)
Unrealized gains (losses) on financial derivatives, net	(18)	(192)	89	(346)
Total return swaps \| Credit Risk [Member]
Derivative [Line Items]
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	0	(41)	0	(1,243)
Realized gains (losses) on financial derivatives, net	0	(41)	0	(1,243)
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	(37)	(465)	(37)	476
Unrealized gains (losses) on financial derivatives, net	(37)	(465)	(37)	476
TBA securities \| Interest Rate Risk [Member]
Derivative [Line Items]
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	9,085	(425)	55,876	0
Realized gains (losses) on financial derivatives, net	9,085	(425)	55,876	0
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	27,926	(2,381)	27,997	(210)
Unrealized gains (losses) on financial derivatives, net	27,926	(2,381)	27,997	(210)
Futures \| Interest Rate Risk [Member]
Derivative [Line Items]
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	445	(271)	15,493	1,641
Realized gains (losses) on financial derivatives, net	445	(271)	15,493	1,641
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	365	843	183	1,721
Unrealized gains (losses) on financial derivatives, net	365	843	183	1,721
Forwards \| Currency risk [Member]
Derivative [Line Items]
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	897	487	1,693	411
Realized gains (losses) on financial derivatives, net	897	487	1,693	411
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	17	(85)	468	640
Unrealized gains (losses) on financial derivatives, net	17	(85)	468	640
Warrants \| Equity Market/Credit Risk [Member]
Derivative [Line Items]
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	0	0	(413)	0
Realized gains (losses) on financial derivatives, net	0	0	(413)	0
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	(140)	221	372	187
Unrealized gains (losses) on financial derivatives, net	(140)	221	372	187
Options \| Credit Risk [Member]
Derivative [Line Items]
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	0	0	147	4,536
Realized gains (losses) on financial derivatives, net	0	0	147	4,536
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	0	(148)	148	(720)
Unrealized gains (losses) on financial derivatives, net	$ 0	$ (148)	$ 148	$ (720)

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