Financial Derivatives (Schedule of Gains and Losses on Derivative Contracts) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Derivative [Line Items]
Net Realized Gains (Losses) on Periodic Settlements of Interest Rate Swaps	$ 9,236	$ (499)	$ 15,027	$ (2,201)
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	20,544	47,278	(10,694)	72,315
Realized gains (losses) on financial derivatives, net	29,780	46,779	4,333	70,114
Change in Net Unrealized Gains (Losses) on Accrued Periodic Settlements of Interest Rate Swaps	3,314	836	6,765	1,397
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	5,028	1,664	4,344	46,402
Unrealized gains (losses) on financial derivatives, net	8,342	2,500	11,109	47,799
Derivative [Member]
Derivative [Line Items]
Foreign currency translation	2	(16)	6	(24)
Interest rate swaps \| Interest Rate Risk [Member]
Derivative [Line Items]
Net Realized Gains (Losses) on Periodic Settlements of Interest Rate Swaps	9,236	(499)	15,027	(2,201)
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	21,942	12,221	(9,133)	10,072
Realized gains (losses) on financial derivatives, net	31,178	11,722	5,894	7,871
Change in Net Unrealized Gains (Losses) on Accrued Periodic Settlements of Interest Rate Swaps	3,314	836	6,765	1,397
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	(7,296)	5,983	5,878	40,035
Unrealized gains (losses) on financial derivatives, net	(3,982)	6,819	12,643	41,432
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		(6)	1	(11)
Realized gains (losses) on financial derivatives, net		(6)	1	(11)
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps		(102)	0	(102)
Unrealized gains (losses) on financial derivatives, net		(102)	0	(102)
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	34	(351)	(241)	(336)
Realized gains (losses) on financial derivatives, net	34	(351)	(241)	(336)
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	(226)	1,297	1,932	1,704
Unrealized gains (losses) on financial derivatives, net	(226)	1,297	1,932	1,704
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	(742)	414	(2,089)	237
Realized gains (losses) on financial derivatives, net	(742)	414	(2,089)	237
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	(1,173)	3,351	(965)	3,657
Unrealized gains (losses) on financial derivatives, net	(1,173)	3,351	(965)	3,657
Credit default swaps on corporate bonds \| Credit Risk [Member]
Derivative [Line Items]
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	(42)	(10)	(83)	(18)
Realized gains (losses) on financial derivatives, net	(42)	(10)	(83)	(18)
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	(5)	92	(24)	108
Unrealized gains (losses) on financial derivatives, net	(5)	92	(24)	108
TBA securities \| Interest Rate Risk [Member]
Derivative [Line Items]
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	(20)	26,003	4,272	147
Realized gains (losses) on financial derivatives, net	(20)	26,003	4,272	147
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	6,457	(3,754)	(3,621)	148
Unrealized gains (losses) on financial derivatives, net	6,457	(3,754)	(3,621)	148
Futures \| Interest Rate Risk [Member]
Derivative [Line Items]
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	(132)	8,390	(3,065)	15,049
Realized gains (losses) on financial derivatives, net	(132)	8,390	(3,065)	15,049
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	6,776	(5,442)	1,113	(182)
Unrealized gains (losses) on financial derivatives, net	6,776	(5,442)	1,113	(182)
Forwards \| Currency risk [Member]
Derivative [Line Items]
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	(496)	470	(356)	797
Realized gains (losses) on financial derivatives, net	(496)	470	(356)	797
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	346	315	(37)	451
Unrealized gains (losses) on financial derivatives, net	346	315	(37)	451
Warrants \| Equity Market/Credit Risk [Member]
Derivative [Line Items]
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	0	0	0	(413)
Realized gains (losses) on financial derivatives, net	0	0	0	(413)
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	149	(254)	68	512
Unrealized gains (losses) on financial derivatives, net	149	(254)	68	512
Options \| Credit Risk [Member]
Derivative [Line Items]
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	0	147	0	46,791
Realized gains (losses) on financial derivatives, net	0	147	0	46,791
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	0	178	0	71
Unrealized gains (losses) on financial derivatives, net	$ 0	$ 178	$ 0	$ 71

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