Investments (Details 2) $ in Thousands	Jun. 30, 2016 USD ($)
Amortized cost
Due in one year or less	$ 45,685
Due after one year through five years	296,550
Due after five years through ten years	188,270
Due after ten years	99,440
Amortized cost, fixed maturities	629,945
Estimated fair value
Due in one year or less	45,799
Due after one year through five years	300,336
Due after five years through ten years	195,896
Due after ten years	102,490
Estimated fair value, fixed maturities	$ 644,521