Supplemental Schedule of Reinsurance Premiums for Insurance Companies: Supplemental Schedule Of Reinsurance Premiums For Insurance Companies Table Text Block (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Life Insurance in Force, Gross	$ 13,770,999	$ 12,466,127	$ 12,063,911
Life Insurance in Force, Assumed	7,054	7,848	129,231
Life Insurance in Force, Ceded	6,878,689	6,303,742	6,365,993
Life Insurance in Force, Net	$ 6,899,364	$ 6,170,233	$ 5,827,149
Life Insurance in Force, Percentage Assumed to Net	0.10%	0.10%	2.20%
Direct Premiums Earned	$ 345,467	$ 560,102	$ 596,325
Assumed Premiums Earned	8,369	21,339	33,152
Ceded Premiums Earned	71,570	318,737	149,943
Premiums Earned, Net	$ 282,266	$ 262,704	$ 479,534
Premiums, Percentage Assumed to Net	3.00%	8.10%	6.90%
Accident and Health Insurance Product Line
Direct Premiums Earned	$ 249,134	$ 461,467	$ 513,814
Assumed Premiums Earned	7,574	19,744	28,822
Ceded Premiums Earned	32,290	276,392	126,613
Premiums Earned, Net	$ 224,418	$ 204,819	$ 416,023
Premiums, Percentage Assumed to Net	3.40%	9.60%	6.90%
Life and Annuity Insurance Product Line
Direct Premiums Earned	$ 56,194	$ 57,938	$ 46,699
Assumed Premiums Earned	795	1,595	4,330
Ceded Premiums Earned	38,899	42,078	23,078
Premiums Earned, Net	$ 18,090	$ 17,455	$ 27,951
Premiums, Percentage Assumed to Net	4.40%	9.10%	15.50%
Property, Liability and Casualty Insurance Product Line
Direct Premiums Earned	$ 40,139	$ 40,697	$ 35,812
Assumed Premiums Earned	0	0	0
Ceded Premiums Earned	381	267	252
Premiums Earned, Net	$ 39,758	$ 40,430	$ 35,560
Premiums, Percentage Assumed to Net	0.00%	0.00%	0.00%