Investments - Available-for-sale Fixed Maturity Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Amortized Cost
Due in one year or less, amortized cost	$ 7,779
Due after one year through five years, amortized cost	30,636
Due after five years through ten years, amortized cost	6,529
Due after ten years, amortized cost	6,284
Securities with contractual maturities, amortized cost	51,228
Commercial mortgage and asset-backed, amortized cost	59,591
Fixed maturity securities, amortized cost	110,819	$ 107,213
Estimated Fair Value
Due in one year or less, fair value	7,784
Due after one year through five years, fair value	31,052
Due after five years through ten years, fair value	6,941
Due after ten years, fair value	6,501
Securities with contractual maturities, fair value	52,278
Commercial mortgage and asset-backed, fair value	60,191
Fixed maturity securities	$ 112,469	$ 107,093