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Investments (Schedule of Fair Value of Fixed Maturity Investments Trading) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Schedule of Investments [Line Items]
Fixed maturity investments	$ 13,506,503	$ 11,171,655
U.S. treasuries
Schedule of Investments [Line Items]
Fixed maturity investments	4,960,409	4,467,345
Agencies
Schedule of Investments [Line Items]
Fixed maturity investments	368,032	343,031
Non-U.S. government
Schedule of Investments [Line Items]
Fixed maturity investments	491,531	497,392
Non-U.S. government-backed corporate
Schedule of Investments [Line Items]
Fixed maturity investments	338,014	321,356
Corporate
Schedule of Investments [Line Items]
Fixed maturity investments	4,261,025	3,075,660
Agency mortgage-backed
Schedule of Investments [Line Items]
Fixed maturity investments	1,113,792	1,148,499
Non-agency mortgage-backed
Schedule of Investments [Line Items]
Fixed maturity investments	291,444	294,604
Commercial mortgage-backed
Schedule of Investments [Line Items]
Fixed maturity investments	791,272	468,698
Asset-backed
Schedule of Investments [Line Items]
Fixed maturity investments	$ 890,984	$ 555,070

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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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