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Investments (Schedule of Fair Value of Fixed Maturity Investments Trading) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Investment [Line Items]
Total fixed maturity investments trading	$ 10,479,666	$ 8,088,870
U.S. treasuries
Investment [Line Items]
Total fixed maturity investments trading	3,961,306	3,331,411
Agencies
Investment [Line Items]
Total fixed maturity investments trading	334,923	174,883
Municipal
Investment [Line Items]
Total fixed maturity investments trading	2,859	6,854
Non-U.S. government
Investment [Line Items]
Total fixed maturity investments trading	370,505	279,818
Non-U.S. government-backed corporate
Investment [Line Items]
Total fixed maturity investments trading	207,668	160,063
Corporate
Investment [Line Items]
Total fixed maturity investments trading	3,268,511	2,450,244
Agency mortgage-backed
Investment [Line Items]
Total fixed maturity investments trading	1,167,735	817,880
Non-agency mortgage-backed
Investment [Line Items]
Total fixed maturity investments trading	266,963	278,680
Commercial mortgage-backed
Investment [Line Items]
Total fixed maturity investments trading	374,584	282,294
Asset-backed
Investment [Line Items]
Total fixed maturity investments trading	$ 524,612	$ 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
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26610-111562

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