Investments, Summary of Realized Investment Gains (Losses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Summary of realized investment gains (losses) [Abstract]
Gains	$ 2,684	$ 5,501
Losses	(89)	(644)
Realized investment gains, net	2,595	4,857
Proceeds from sales of investments [Abstract]
Total proceeds	$ 62,361	84,873
Percentage of investment grade securities in bond portfolio	88.00%
Fixed Maturities [Member]
Summary of realized investment gains (losses) [Abstract]
Gains	$ 1,119	2,347
Losses	(89)	(628)
Realized investment gains, net	1,030	1,719
Proceeds from sales of investments [Abstract]
Total proceeds	59,072	80,995
Equity Securities [Member]
Summary of realized investment gains (losses) [Abstract]
Gains	0	0
Losses	0	(16)
Realized investment gains, net	0	(16)
Other Investments [Member]
Summary of realized investment gains (losses) [Abstract]
Gains	1,565	3,154
Losses	0	0
Realized investment gains, net	1,565	3,154
Proceeds from sales of investments [Abstract]
Total proceeds	$ 3,289	$ 3,878