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Investments (Other Invested Assets) (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
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Other Investments [Line Items] |  |
Other invested assets | $ 1,165,021 | $ 1,324,960
Equity securities |  |
Other Investments [Line Items] |  |
Other invested assets | 161,950 | 405,731
Limited Partner [Member] |  |
Other Investments [Line Items] |  |
Other invested assets | 439,695 | 411,456
Structured loans |  |
Other Investments [Line Items] |  |
Other invested assets | 182,977 | 223,549
Derivatives |  |
Other Investments [Line Items] |  |
Other invested assets | 163,554 | 75,227
Fair Value Option Contractholder Directed Unit Linked Investments [Member] |  |
Other Investments [Line Items] |  |
Other invested assets | 142,125 | 138,892
Other |  |
Other Investments [Line Items] |  |
Other invested assets | $ 74,720 | $ 70,105

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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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