Investments (Details 2) $ in Thousands	Dec. 31, 2015 USD ($)
Amortized cost
Due in one year or less	$ 62,113
Due after one year through five years	267,468
Due after five years through ten years	163,827
Due after ten years	88,564
Amortized cost, fixed maturities	581,972
Estimated fair value
Due in one year or less	62,067
Due after one year through five years	265,917
Due after five years through ten years	168,918
Due after ten years	90,307
Estimated fair value, fixed maturities	$ 587,209