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Investments (Schedule of Fair Value of Fixed Maturity Investments Trading) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Investment [Line Items]
Fixed maturity investments trading, at fair value	$ 6,890,592	$ 6,765,005
U.S. treasuries
Investment [Line Items]
Fixed maturity investments trading, at fair value	2,475,747	2,064,944
Agencies
Investment [Line Items]
Fixed maturity investments trading, at fair value	85,270	137,976
Municipal
Investment [Line Items]
Fixed maturity investments trading, at fair value	564,555	583,282
Non-U.S. government (Sovereign Debt)
Investment [Line Items]
Fixed maturity investments trading, at fair value	353,756	334,981
Non-U.S. government-backed corporate
Investment [Line Items]
Fixed maturity investments trading, at fair value	164,724	138,994
Corporate
Investment [Line Items]
Fixed maturity investments trading, at fair value	1,833,825	2,055,323
Agency mortgage-backed
Investment [Line Items]
Fixed maturity investments trading, at fair value	497,943	504,368
Non-agency mortgage-backed
Investment [Line Items]
Fixed maturity investments trading, at fair value	248,609	262,235
Commercial mortgage-backed
Investment [Line Items]
Fixed maturity investments trading, at fair value	535,068	554,625
Asset-backed
Investment [Line Items]
Fixed maturity investments trading, at fair value	$ 131,095	$ 128,277

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=49167202&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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562

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