Financial Schedules Schedule III - Supplemental Insurance Information (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Supplementary Insurance Information, by Segment [Line Items]
Supplementary Insurance Information, Deferred policy acquisition costs	$ 167,063	$ 167,790
Supplementary Insurance Information, Future policy benefit reserves and policy claims payable	1,217,163	1,139,860
Supplementary Insurance Information, Unearned premiums	1,329	1,154
Supplementary Insurance Information, Other policy claims and benefits payable	82,298	75,685
Life Insurance Segment [Member]
Supplementary Insurance Information, by Segment [Line Items]
Supplementary Insurance Information, Deferred policy acquisition costs	130,566	132,704
Supplementary Insurance Information, Future policy benefit reserves and policy claims payable	943,907	871,136
Supplementary Insurance Information, Unearned premiums	1,090	915
Supplementary Insurance Information, Other policy claims and benefits payable	80,503	73,860
Home Service Insurance Segment [Member]
Supplementary Insurance Information, by Segment [Line Items]
Supplementary Insurance Information, Deferred policy acquisition costs	36,497	35,086
Supplementary Insurance Information, Future policy benefit reserves and policy claims payable	273,256	268,724
Supplementary Insurance Information, Unearned premiums	239	239
Supplementary Insurance Information, Other policy claims and benefits payable	1,795	1,825
Other Non-Insurance Enterprises [Member]
Supplementary Insurance Information, by Segment [Line Items]
Supplementary Insurance Information, Deferred policy acquisition costs	0	0
Supplementary Insurance Information, Future policy benefit reserves and policy claims payable	0	0
Supplementary Insurance Information, Unearned premiums	0	0
Supplementary Insurance Information, Other policy claims and benefits payable	$ 0	$ 0