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Investments (Other Invested Assets) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Other invested assets | $ 1,512,147 | $ 1,505,332
Limited Partner [Member] |  |
Other invested assets | 805,613 | 781,124
Equity Release Mortgages [Member] |  |
Other invested assets | 261,837 | 219,940
Derivatives |  |
Other invested assets | 132,195 | 137,613
Fair Value Option Contractholder Directed Unit Linked Investments [Member] |  |
Other invested assets | 221,512 | 218,541
Other |  |
Other invested assets | $ 90,990 | $ 148,114

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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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