Investments - Available-for-sale Fixed Maturity Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Amortized Cost
Due in one year or less, amortized cost	$ 8,237
Due after one year through five years, amortized cost	30,306
Due after five years through ten years, amortized cost	6,672
Due after ten years, amortized cost	6,380
Securities with contractual maturities, amortized cost	51,595
Commercial mortgage and asset-backed, amortized cost	60,665
Fixed maturity securities, amortized cost	112,260	$ 107,213
Estimated Fair Value
Due in one year or less, fair value	8,241
Due after one year through five years, fair value	30,644
Due after five years through ten years, fair value	7,067
Due after ten years, fair value	6,564
Securities with contractual maturities, fair value	52,516
Commercial mortgage and asset-backed, fair value	61,325
Fixed maturity securities	$ 113,841	$ 107,093