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Investments (Schedule of Fair Value of Fixed Maturity Investments Trading) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Schedule of Investments [Line Items]
Total fixed maturity investments trading	$ 13,029,085	$ 13,507,131
U.S. treasuries
Schedule of Investments [Line Items]
Total fixed maturity investments trading	5,792,746	6,247,779
Agencies
Schedule of Investments [Line Items]
Total fixed maturity investments trading	363,256	361,684
Non-U.S. government
Schedule of Investments [Line Items]
Total fixed maturity investments trading	485,193	549,613
Non-U.S. government-backed corporate
Schedule of Investments [Line Items]
Total fixed maturity investments trading	431,008	474,848
Corporate
Schedule of Investments [Line Items]
Total fixed maturity investments trading	3,420,946	3,214,438
Agency mortgage-backed
Schedule of Investments [Line Items]
Total fixed maturity investments trading	714,176	721,955
Non-agency mortgage-backed
Schedule of Investments [Line Items]
Total fixed maturity investments trading	212,145	233,346
Commercial mortgage-backed
Schedule of Investments [Line Items]
Total fixed maturity investments trading	567,186	634,925
Asset-backed
Schedule of Investments [Line Items]
Total fixed maturity investments trading	$ 1,042,429	$ 1,068,543

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+ References

No definition available.

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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=124260329&loc=d3e26610-111562

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-Publisher FASB
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