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Investments (Details 19) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
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Other Investments [Line Items] |  |
Other invested assets | $ 1,035,809 | $ 1,159,543
Equity securities |  |
Other Investments [Line Items] |  |
Other invested assets | 160,339 | 222,700
Limited partnerships and real estate joint ventures |  |
Other Investments [Line Items] |  |
Other invested assets | 423,790 | 356,419
Structured loans |  |
Other Investments [Line Items] |  |
Other invested assets | 245,734 | 306,497
Derivatives |  |
Other Investments [Line Items] |  |
Other invested assets | 118,791 | 168,208
Other |  |
Other Investments [Line Items] |  |
Other invested assets | $ 87,155 | $ 105,719

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- Definition Other investments not otherwise specified in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 12 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph g -Article 7 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 210.7-03.1(f,g)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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