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Investments (Schedule of Fair Value of Fixed Maturity Investments Trading) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Schedule of Investments [Line Items]
Total fixed maturity investments trading	$ 13,309,234	$ 13,506,503
U.S. treasuries
Schedule of Investments [Line Items]
Total fixed maturity investments trading	5,107,878	4,960,409
Agencies
Schedule of Investments [Line Items]
Total fixed maturity investments trading	227,184	368,032
Non-U.S. government
Schedule of Investments [Line Items]
Total fixed maturity investments trading	518,162	491,531
Non-U.S. government-backed corporate
Schedule of Investments [Line Items]
Total fixed maturity investments trading	335,662	338,014
Corporate
Schedule of Investments [Line Items]
Total fixed maturity investments trading	4,289,072	4,261,025
Agency mortgage-backed
Schedule of Investments [Line Items]
Total fixed maturity investments trading	957,563	1,113,792
Non-agency mortgage-backed
Schedule of Investments [Line Items]
Total fixed maturity investments trading	272,529	291,444
Commercial mortgage-backed
Schedule of Investments [Line Items]
Total fixed maturity investments trading	713,044	791,272
Asset-backed
Schedule of Investments [Line Items]
Total fixed maturity investments trading	$ 888,140	$ 890,984

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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=121553693&loc=d3e26610-111562

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-Publisher FASB
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