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Investments (Schedule of Fair Value of Fixed Maturity Investments Trading) (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Investment [Line Items]
Fixed maturity investments trading, at fair value	$ 6,591,434	$ 4,756,685
U.S. treasuries
Investment [Line Items]
Fixed maturity investments trading, at fair value	2,020,746	1,671,471
Agencies
Investment [Line Items]
Fixed maturity investments trading, at fair value	144,947	96,208
Municipal
Investment [Line Items]
Fixed maturity investments trading, at fair value	806,724	0
Non-U.S. government (Sovereign Debt)
Investment [Line Items]
Fixed maturity investments trading, at fair value	370,613	280,651
Non-U.S. government-backed corporate
Investment [Line Items]
Fixed maturity investments trading, at fair value	172,381	146,467
Corporate
Investment [Line Items]
Fixed maturity investments trading, at fair value	1,865,369	1,610,442
Agency mortgage-backed
Investment [Line Items]
Fixed maturity investments trading, at fair value	474,966	312,333
Non-agency mortgage-backed
Investment [Line Items]
Fixed maturity investments trading, at fair value	253,044	241,590
Commercial mortgage-backed
Investment [Line Items]
Fixed maturity investments trading, at fair value	419,218	373,117
Asset-backed
Investment [Line Items]
Fixed maturity investments trading, at fair value	$ 63,426	$ 24,406

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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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 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 2: 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=6871852&loc=d3e26626-111562



Reference 3: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Glossary Trading Securities



-URI http://asc.fasb.org/extlink&oid=6526789



Reference 4: 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 5: http://www.xbrl.org/2003/role/presentationRef



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-Name Accounting Standards Codification



-Topic 320



-SubTopic 10



-Section 45



-Paragraph 1



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