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Investments (Schedule of Fair Value of Fixed Maturity Investments Trading) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Investment [Line Items]
Total fixed maturity investments trading	$ 7,814,779	$ 7,426,555
U.S. treasuries
Investment [Line Items]
Total fixed maturity investments trading	3,117,911	3,168,763
Agencies
Investment [Line Items]
Total fixed maturity investments trading	143,980	47,646
Municipal
Investment [Line Items]
Total fixed maturity investments trading	7,061	509,802
Non-U.S. government (Sovereign debt)
Investment [Line Items]
Total fixed maturity investments trading	254,169	287,660
Non-U.S. government-backed corporate
Investment [Line Items]
Total fixed maturity investments trading	137,512	163,651
Corporate
Investment [Line Items]
Total fixed maturity investments trading	2,448,795	2,063,459
Agency mortgage-backed
Investment [Line Items]
Total fixed maturity investments trading	836,376	500,456
Non-agency mortgage-backed
Investment [Line Items]
Total fixed maturity investments trading	289,649	300,331
Commercial mortgage-backed
Investment [Line Items]
Total fixed maturity investments trading	257,434	202,062
Asset-backed
Investment [Line Items]
Total fixed maturity investments trading	$ 321,892	$ 182,725

X

- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 12
-Sentence Column A

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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=109979856&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=109979856&loc=d3e26610-111562

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