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Derivative Instruments (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Assets    
Derivative instruments, included in Short-term and Other Investments $ 2,412us-gaap_DerivativeAssets $ 2,458us-gaap_DerivativeAssets
Liabilities    
Fixed indexed annuities - embedded derivatives, included in Other Policyholder Funds $ 22,040us-gaap_DerivativeLiabilities $ 20,049us-gaap_DerivativeLiabilities