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Investments (Other Invested Assets) (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
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Other invested assets | $ 1,682,143 | $ 1,298,120
Equity securities |  |
Other invested assets | 418,186 | 125,862
Limited Partner [Member] |  |
Other invested assets | 635,574 | 567,697
Derivatives |  |
Other invested assets | 310,796 | 256,178
Fair Value Option Contractholder Directed Unit Linked Investments [Member] |  |
Other invested assets | 195,842 | 197,547
Other |  |
Other invested assets | $ 121,745 | $ 150,836

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- Definition Amount of investments classified as other. + 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 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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