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Investments (Other Invested Assets) (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
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Other invested assets | $ 1,429,175 | $ 1,591,940
Equity securities |  |
Other invested assets | 111,616 | 275,361
Limited Partner [Member] |  |
Other invested assets | 706,143 | 687,522
Derivatives |  |
Other invested assets | 170,183 | 229,108
Fair Value Option Contractholder Directed Unit Linked Investments [Member] |  |
Other invested assets | 193,600 | 190,120
Other |  |
Other invested assets | $ 247,633 | $ 209,829

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