Financial Derivatives (Schedule of Gains and Losses on Derivative Contracts) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Derivative [Line Items]
Net Realized Gains (Losses) on Periodic Settlements of Interest Rate Swaps	$ (1,702)	$ (816)
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	25,037	6,629
Realized gains (losses) on financial derivatives, net	23,335	5,813
Change in Net Unrealized Gains (Losses) on Accrued Periodic Settlements of Interest Rate Swaps	561	410
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	44,738	10,267
Unrealized gains (losses) on financial derivatives, net	45,299	10,677
Derivative [Member]
Derivative [Line Items]
Foreign currency transactions		18
Foreign currency translation	(8)	(34)
Interest rate swaps \| Interest Rate Risk [Member]
Derivative [Line Items]
Net Realized Gains (Losses) on Periodic Settlements of Interest Rate Swaps	(1,702)	(816)
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	(2,149)	447
Realized gains (losses) on financial derivatives, net	(3,851)	(369)
Change in Net Unrealized Gains (Losses) on Accrued Periodic Settlements of Interest Rate Swaps	561	410
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	34,051	7,675
Unrealized gains (losses) on financial derivatives, net	34,612	8,085
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)	26
Realized gains (losses) on financial derivatives, net	(4)	26
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	1	(27)
Unrealized gains (losses) on financial derivatives, net	1	(27)
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	15	1,069
Realized gains (losses) on financial derivatives, net	15	1,069
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	407	(958)
Unrealized gains (losses) on financial derivatives, net	407	(958)
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	(177)	(924)
Realized gains (losses) on financial derivatives, net	(177)	(924)
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	306	528
Unrealized gains (losses) on financial derivatives, net	306	528
Credit default swaps on corporate bonds \| Credit Risk [Member]
Derivative [Line Items]
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	(8)	(72)
Realized gains (losses) on financial derivatives, net	(8)	(72)
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	16	66
Unrealized gains (losses) on financial derivatives, net	16	66
Total return swaps \| Credit Risk [Member]
Derivative [Line Items]
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps		(341)
Realized gains (losses) on financial derivatives, net		(341)
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps		139
Unrealized gains (losses) on financial derivatives, net		139
TBA securities \| Interest Rate Risk [Member]
Derivative [Line Items]
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	20,788	5,319
Realized gains (losses) on financial derivatives, net	20,788	5,319
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	3,825	(703)
Unrealized gains (losses) on financial derivatives, net	3,825	(703)
Futures \| Interest Rate Risk [Member]
Derivative [Line Items]
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	6,659	1,017
Realized gains (losses) on financial derivatives, net	6,659	1,017
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	5,260	2,915
Unrealized gains (losses) on financial derivatives, net	5,260	2,915
Forwards \| Currency risk [Member]
Derivative [Line Items]
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	326	88
Realized gains (losses) on financial derivatives, net	326	88
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	136	627
Unrealized gains (losses) on financial derivatives, net	136	627
Warrants \| Equity Market/Credit Risk [Member]
Derivative [Line Items]
Net Realized Gains (Losses) Other Than Periodic Settlements of Interest Rate Swaps	(413)	0
Realized gains (losses) on financial derivatives, net	(413)	0
Change in Net Unrealized Gains (Losses) Other Than on Accrued Periodic Settlements of Interest Rate Swaps	766	5
Unrealized gains (losses) on financial derivatives, net	766	$ 5
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	(30)
Unrealized gains (losses) on financial derivatives, net	$ (30)

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