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Investments (Schedule of Fair Value of Fixed Maturity Investments Trading) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Investment [Line Items]
Total fixed maturity investments trading	$ 9,473,160	$ 8,088,870
U.S. treasuries
Investment [Line Items]
Total fixed maturity investments trading	3,097,089	3,331,411
Agencies
Investment [Line Items]
Total fixed maturity investments trading	182,904	174,883
Municipal
Investment [Line Items]
Total fixed maturity investments trading	256,967	6,854
Non-U.S. government
Investment [Line Items]
Total fixed maturity investments trading	687,021	279,818
Non-U.S. government-backed corporate
Investment [Line Items]
Total fixed maturity investments trading	286,331	160,063
Corporate
Investment [Line Items]
Total fixed maturity investments trading	2,971,018	2,450,244
Agency mortgage-backed
Investment [Line Items]
Total fixed maturity investments trading	955,616	817,880
Non-agency mortgage-backed
Investment [Line Items]
Total fixed maturity investments trading	272,880	278,680
Commercial mortgage-backed
Investment [Line Items]
Total fixed maturity investments trading	245,323	282,294
Asset-backed
Investment [Line Items]
Total fixed maturity investments trading	518,011	$ 306,743
TMR Group Entities
Investment [Line Items]
Total fixed maturity investments trading	$ 2,200,000

X

- Definition

Line items represent reporting concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ 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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