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Derivative Instruments (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Assets    
Derivative instruments, included in Short-term and Other Investments $ 2,458us-gaap_DerivativeAssets $ 0us-gaap_DerivativeAssets
Liabilities    
Fixed indexed annuities - embedded derivatives, included in Other Policyholder Funds $ 20,049us-gaap_DerivativeLiabilities $ 0us-gaap_DerivativeLiabilities