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Derivative Instruments - Fair Value of Derivatives in Consolidated Balance Sheets (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Assets |  |
Derivative instruments, included in Short-term and other investments | $ 10,431 | $ 8,694
Short-term and other investments |  |
Assets |  |
Derivative instruments, included in Short-term and other investments | 10,431 | 8,694
Other policyholder funds |  |
Liabilities |  |
FIA - embedded derivatives, included in Other policyholder funds | 72,986 | 59,393
Investment contract and life policy reserves |  |
Liabilities |  |
IUL - embedded derivatives, included in Investment contract and life policy reserves | $ 390 | $ 158

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