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Investments (Details 2)
$ in Thousands
Mar. 31, 2016
USD ($)
Amortized cost  
Due in one year or less $ 53,995
Due after one year through five years 275,900
Due after five years through ten years 174,612
Due after ten years 91,748
Amortized cost, fixed maturities 596,255
Estimated fair value  
Due in one year or less 53,962
Due after one year through five years 277,046
Due after five years through ten years 181,441
Due after ten years 93,832
Estimated fair value, fixed maturities $ 606,281