Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred policy acquisition costs asset by segment
Total	$ 267,580	$ 253,176
Retirement annuity [Member]
Deferred policy acquisition costs asset by segment
Total	188,117	178,300
Life [Member]
Deferred policy acquisition costs asset by segment
Total	51,859	48,191
Property and Casualty [Member]
Deferred policy acquisition costs asset by segment
Total	$ 27,604	$ 26,685