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Investments (Schedule of Fair Value of Fixed Maturity Investments Trading) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Investment [Line Items]
Total fixed maturity investments trading	$ 11,386,228	$ 8,088,870
U.S. treasuries
Investment [Line Items]
Total fixed maturity investments trading	4,314,006	3,331,411
Agencies
Investment [Line Items]
Total fixed maturity investments trading	507,903	174,883
Municipal
Investment [Line Items]
Total fixed maturity investments trading	1,629	6,854
Non-U.S. government
Investment [Line Items]
Total fixed maturity investments trading	379,154	279,818
Non-U.S. government-backed corporate
Investment [Line Items]
Total fixed maturity investments trading	263,170	160,063
Corporate
Investment [Line Items]
Total fixed maturity investments trading	3,453,222	2,450,244
Agency mortgage-backed
Investment [Line Items]
Total fixed maturity investments trading	1,248,722	817,880
Non-agency mortgage-backed
Investment [Line Items]
Total fixed maturity investments trading	261,850	278,680
Commercial mortgage-backed
Investment [Line Items]
Total fixed maturity investments trading	406,268	282,294
Asset-backed
Investment [Line Items]
Total fixed maturity investments trading	$ 550,304	$ 306,743

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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=118954083&loc=d3e26610-111562

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-Publisher FASB
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-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26610-111562

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