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Derivative Instruments (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Derivatives, Fair Value [Line Items]    
Concentration Risk, Credit Risk, Financial Instrument, Maximum Exposure $ 250,000  
Fixed Indexed Annuities Term Minimum 10 years  
Other Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value of Collateral $ 2,617 $ 1,955