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Investments (HTM Fixed Maturity Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Due in one year or less carrying value $ 55,505  
Due after one year through five years carrying value 37,536  
Due after five years through 10 years carrying value 8,515  
Total HTM fixed income securities carrying value 101,556 $ 201,354
Due in one year or less fair value 56,249  
Due after one year through five years fair value 39,853  
Due after five years through 10 years fair value 9,109  
Total HTM fixed income securities fair value $ 105,211 $ 209,544