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Investments (Schedule of Fair Value of Fixed Maturity Investments Trading) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Investment [Line Items]
Total fixed maturity investments trading	$ 7,420,778	$ 7,426,555
U.S. treasuries
Investment [Line Items]
Total fixed maturity investments trading	2,968,855	3,168,763
Agencies
Investment [Line Items]
Total fixed maturity investments trading	55,199	47,646
Municipal
Investment [Line Items]
Total fixed maturity investments trading	6,164	509,802
Non-U.S. government (Sovereign debt)
Investment [Line Items]
Total fixed maturity investments trading	298,811	287,660
Non-U.S. government-backed corporate
Investment [Line Items]
Total fixed maturity investments trading	185,640	163,651
Corporate
Investment [Line Items]
Total fixed maturity investments trading	2,280,080	2,063,459
Agency mortgage-backed
Investment [Line Items]
Total fixed maturity investments trading	762,077	500,456
Non-agency mortgage-backed
Investment [Line Items]
Total fixed maturity investments trading	300,311	300,331
Commercial mortgage-backed
Investment [Line Items]
Total fixed maturity investments trading	248,590	202,062
Asset-backed
Investment [Line Items]
Total fixed maturity investments trading	$ 315,051	$ 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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Amount of investments in debt securities classified as trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.4)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.(a),1)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562

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