Investments (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Summary of realized investment gains (losses)
Net realized investment gains	$ 12,713	$ 10,917	$ 22,245
Fixed Maturities [Member]
Summary of realized investment gains (losses)
Net realized investment gains	10,289	8,150	18,480
Equity Securities [Member]
Summary of realized investment gains (losses)
Net realized investment gains	1,378	2,793	3,765
Short Term And Other Investments [Member]
Summary of realized investment gains (losses)
Net realized investment gains	$ 1,046	$ (26)	$ 0