Financial Derivatives (Schedule of Gains and Losses on Derivative Contracts) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Derivative [Line Items]
Net Realized Gains (Losses) on Periodic Settlements of Interest Rate Swaps	$ (2,277)	$ (2,038)	$ 1,695
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	13,796	(29,471)	(32,562)
Realized gains (losses) on financial derivatives, net	11,519	(31,509)	(30,867)
Change in Net Unrealized Gains (Losses) on Accrued Periodic Settlements of Interest Rate Swaps	(763)	219	(764)
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	11,075	831	(4,573)
Unrealized gains (losses) on financial derivatives, net	10,312	1,050	(5,337)
Foreign currency transactions	(224)	(173)	(2,392)
Derivative [Member]
Derivative [Line Items]
Foreign currency transactions	18	12	45
Foreign currency translation	(43)	61	1
Interest rate swaps \| Interest Rate Risk [Member]
Derivative [Line Items]
Net Realized Gains (Losses) on Periodic Settlements of Interest Rate Swaps	(2,277)	(2,038)	1,695
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	644	(17,060)	(876)
Realized gains (losses) on financial derivatives, net	(1,633)	(19,098)	819
Change in Net Unrealized Gains (Losses) on Accrued Periodic Settlements of Interest Rate Swaps	(763)	219	(764)
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	12,051	(6,597)	(5,778)
Unrealized gains (losses) on financial derivatives, net	11,288	(6,378)	(6,542)
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	34	(5,452)	528
Realized gains (losses) on financial derivatives, net	34	(5,452)	528
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	(43)	5,402	(479)
Unrealized gains (losses) on financial derivatives, net	(43)	5,402	(479)
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	931	6,486	(1,883)
Realized gains (losses) on financial derivatives, net	931	6,486	(1,883)
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	(1,039)	2,691	(1,848)
Unrealized gains (losses) on financial derivatives, net	(1,039)	2,691	(1,848)
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	(330)	1,502	(5,262)
Realized gains (losses) on financial derivatives, net	(330)	1,502	(5,262)
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	(963)	(712)	(1,364)
Unrealized gains (losses) on financial derivatives, net	(963)	(712)	(1,364)
Credit default swaps on corporate bonds \| Credit Risk [Member]
Derivative [Line Items]
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	256	285	(708)
Realized gains (losses) on financial derivatives, net	256	285	(708)
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	(345)	486	1,007
Unrealized gains (losses) on financial derivatives, net	(345)	486	1,007
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)	(1,460)
Realized gains (losses) on financial derivatives, net	(1,242)	(2,057)	(1,460)
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	476	114	(584)
Unrealized gains (losses) on financial derivatives, net	476	114	(584)
TBA securities \| Interest Rate Risk [Member]
Derivative [Line Items]
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	8,020	(4,624)	(15,755)
Realized gains (losses) on financial derivatives, net	8,020	(4,624)	(15,755)
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	283	454	4,026
Unrealized gains (losses) on financial derivatives, net	283	454	4,026
Futures \| Interest Rate Risk [Member]
Derivative [Line Items]
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	4,656	(7,447)	(7,924)
Realized gains (losses) on financial derivatives, net	4,656	(7,447)	(7,924)
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	776	(477)	458
Unrealized gains (losses) on financial derivatives, net	776	(477)	458
Forwards \| Currency risk [Member]
Derivative [Line Items]
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	1,183	(1,004)	813
Realized gains (losses) on financial derivatives, net	1,183	(1,004)	813
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	73	(153)	(12)
Unrealized gains (losses) on financial derivatives, net	73	(153)	(12)
Warrants \| Equity Market/Credit Risk [Member]
Derivative [Line Items]
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	0	0
Realized gains (losses) on financial derivatives, net	0	0
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	(46)	(377)
Unrealized gains (losses) on financial derivatives, net	(46)	(377)
Options \| Interest Rate Risk [Member]
Derivative [Line Items]
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps		(100)	(35)
Realized gains (losses) on financial derivatives, net		(100)	(35)
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps		0	1
Unrealized gains (losses) on financial derivatives, net		$ 0	$ 1
Put Option [Member] \| Credit Risk [Member]
Derivative [Line Items]
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	(356)
Realized gains (losses) on financial derivatives, net	(356)
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)

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