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Investments (Other Invested Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Other Investments [Abstract] |  |
Other invested assets | $ 1,915,297 | $ 1,505,332
Limited Partner [Member] |  |
Other Investments [Abstract] |  |
Other invested assets | 965,094 | 781,124
Gain (Loss) on Derivatives [Member] |  |
Other Investments [Abstract] |  |
Other invested assets | 180,699 | 137,613
Fair Value Option Contractholder Directed Unit Linked Investments [Member] |  |
Other Investments [Abstract] |  |
Other invested assets | 197,770 | 218,541
Other [Member] |  |
Other Investments [Abstract] |  |
Other invested assets | 95,829 | 148,114
Equity Release Mortgages [Member] |  |
Other Investments [Abstract] |  |
Other invested assets | $ 475,905 | $ 219,940

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- Definition Amount of investments classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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