Investments - Investments Classified by Contractual Maturity Date (Details) - Fixed Maturities - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Cost or Amortized Cost
Due in one year or less	$ 38,741
Due after one year through five years	224,697
Due after five years through ten years	142,564
Due after ten years	47,621
Cost or adjusted/amortized cost	$ 453,623	$ 396,415
Percent of Total
Due in one year or less	8.50%
Due after one year through five years	49.50%
Due after five years through ten years	31.50%
Due after ten years	10.50%
Total	100.00%
Fair Value
Due in one year or less	$ 38,780
Due after one year through five years	228,833
Due after five years through ten years	147,667
Due after ten years	50,445
Total	$ 465,725	$ 396,698
Percent of Total
Due in one year or less	8.30%
Due after one year through five years	49.10%
Due after five years through ten years	31.70%
Due after ten years	10.90%
Total	100.00%