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Derivative Instruments - Fair Value of Derivatives in Consolidated Balance Sheets (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Assets |  |
Derivative instruments, included in Short-term and other investments | $ 12,630 | $ 15,550
Short-term and other investments |  |
Assets |  |
Derivative instruments, included in Short-term and other investments | 12,630 | 15,550
Other policyholder funds |  |
Liabilities |  |
FIA - embedded derivatives, included in Other policyholder funds | 78,486 | 80,733
Investment contract and life policy reserves |  |
Liabilities |  |
IUL - embedded derivatives, included in Investment contract and life policy reserves | $ 518 | $ 594

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