Financial Derivatives (Schedule of Gains and Losses on Derivative Contracts) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Net Realized Gains (Losses) on Periodic Settlements of Interest Rate Swaps	$ 4,514	$ (2,277)	$ (2,038)
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	115,975	13,796	(29,471)
Realized gains (losses) on financial derivatives, net	120,489	11,519	(31,509)
Change in Net Unrealized Gains (Losses) on Accrued Periodic Settlements of Interest Rate Swaps	4,134	(763)	219
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	49,738	11,075	831
Unrealized gains (losses) on financial derivatives, net	53,872	10,312	1,050
Foreign currency transactions	150	(224)	(173)
Foreign currency translation	882	(487)	(1,720)
Derivative [Member]
Derivative [Line Items]
Foreign currency transactions		18
Foreign currency translation	(19)	(43)
Interest rate swaps \| Interest Rate Risk [Member]
Derivative [Line Items]
Net Realized Gains (Losses) on Periodic Settlements of Interest Rate Swaps	4,514	(2,277)	(2,038)
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	21,549	644	(17,060)
Realized gains (losses) on financial derivatives, net	26,063	(1,633)	(19,098)
Change in Net Unrealized Gains (Losses) on Accrued Periodic Settlements of Interest Rate Swaps	4,134	(763)	219
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	46,989	12,051	(6,597)
Unrealized gains (losses) on financial derivatives, net	51,123	11,288	(6,378)
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	(855)	34	(5,452)
Realized gains (losses) on financial derivatives, net	(855)	34	(5,452)
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	615	(43)	5,402
Unrealized gains (losses) on financial derivatives, net	615	(43)	5,402
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	(277)	931	6,486
Realized gains (losses) on financial derivatives, net	(277)	931	6,486
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	982	(1,039)	2,691
Unrealized gains (losses) on financial derivatives, net	982	(1,039)	2,691
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	862	(330)	1,502
Realized gains (losses) on financial derivatives, net	862	(330)	1,502
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	(1,064)	(963)	(712)
Unrealized gains (losses) on financial derivatives, net	(1,064)	(963)	(712)
Credit default swaps on corporate bonds \| Credit Risk [Member]
Derivative [Line Items]
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	(284)	256	285
Realized gains (losses) on financial derivatives, net	(284)	256	285
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	128	(345)	486
Unrealized gains (losses) on financial derivatives, net	128	(345)	486
Total return swaps \| Credit Risk [Member]
Derivative [Line Items]
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps		(1,242)	(2,057)
Realized gains (losses) on financial derivatives, net		(1,242)	(2,057)
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps		476	114
Unrealized gains (losses) on financial derivatives, net		476	114
TBA securities \| Interest Rate Risk [Member]
Derivative [Line Items]
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	73,304	(356)	(4,624)
Realized gains (losses) on financial derivatives, net	73,304	(356)	(4,624)
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	5,658	(148)	454
Unrealized gains (losses) on financial derivatives, net	5,658	(148)	454
Futures \| Interest Rate Risk [Member]
Derivative [Line Items]
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	20,586	4,656	(7,447)
Realized gains (losses) on financial derivatives, net	20,586	4,656	(7,447)
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	(4,848)	776	(477)
Unrealized gains (losses) on financial derivatives, net	(4,848)	776	(477)
Forwards \| Currency risk [Member]
Derivative [Line Items]
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	1,045	1,183	(1,004)
Realized gains (losses) on financial derivatives, net	1,045	1,183	(1,004)
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	285	73	(153)
Unrealized gains (losses) on financial derivatives, net	285	73	(153)
Warrants \| Equity Market/Credit Risk [Member]
Derivative [Line Items]
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	(102)	0	0
Realized gains (losses) on financial derivatives, net	(102)	0	0
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	845	(46)	(377)
Unrealized gains (losses) on financial derivatives, net	845	(46)	(377)
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
Options \| Credit Risk [Member]
Derivative [Line Items]
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	147	8,020
Realized gains (losses) on financial derivatives, net	147	8,020
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	148	283
Unrealized gains (losses) on financial derivatives, net	$ 148	$ 283

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