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Investments (Schedule of Fair Value of Fixed Maturity Investments Trading) (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
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Investment [Line Items] |  |
Fixed maturity investments trading, at fair value | $ 4,841,609 | $ 4,809,036
U.S. treasuries |  |
Investment [Line Items] |  |
Fixed maturity investments trading, at fair value | 1,706,929 | 1,352,413
Agencies |  |
Investment [Line Items] |  |
Fixed maturity investments trading, at fair value | 121,650 | 186,050
Non-U.S. government (Sovereign Debt) |  |
Investment [Line Items] |  |
Fixed maturity investments trading, at fair value | 271,495 | 334,580
Non-U.S. government-backed corporate |  |
Investment [Line Items] |  |
Fixed maturity investments trading, at fair value | 163,911 | 237,479
Corporate |  |
Investment [Line Items] |  |
Fixed maturity investments trading, at fair value | 1,580,038 | 1,803,415
Agency mortgage-backed |  |
Investment [Line Items] |  |
Fixed maturity investments trading, at fair value | 321,629 | 336,661
Non-agency mortgage-backed |  |
Investment [Line Items] |  |
Fixed maturity investments trading, at fair value | 252,530 | 243,795
Commercial mortgage-backed |  |
Investment [Line Items] |  |
Fixed maturity investments trading, at fair value | 392,085 | 303,214
Asset-backed |  |
Investment [Line Items] |  |
Fixed maturity investments trading, at fair value | $ 31,342 | $ 11,429

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- Definition 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 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 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 -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 4: 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 5: 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 + Details
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