Investments Cash, Cash Equivalents and Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Fixed maturity securities	$ 1,190,965	$ 1,208,570
Fixed maturity securities percent	88.00%	89.30%
Equity security	$ 15,372
Equity Securities		$ 16,164
Equity securities percent	1.10%	1.20%
Mortgage loans	$ 190	$ 195
Mortgage loans percent	0.00%	0.00%
Policy loans	$ 77,577	$ 73,735
Policy loans percent	5.70%	5.50%
Real estate and other long-term investments	$ 7,286	$ 7,452
Real estate and other long-term investments percent	0.50%	0.60%
Cash and cash equivalents	$ 63,333	$ 46,064	$ 33,749	$ 35,510
Cash and cash equivalents percent	4.70%	3.40%
Total cash, cash equivalents and investments	$ 1,354,723	$ 1,352,180
Total cash, cash equivalents and investments percent	100.00%	100.00%