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, 2018	Dec. 31, 2017
SEC Schedule, 12-17, Insurance Companies, Reinsurance, Life Insurance in Force, Gross	$ 14,486,642	$ 13,770,999
SEC Schedule, 12-17, Insurance Companies, Reinsurance, Life Insurance in Force, Assumed	6,546	7,054
SEC Schedule, 12-17, Insurance Companies, Reinsurance, Life Insurance in Force, Ceded	7,528,651	6,878,689
SEC Schedule, 12-17, Insurance Companies, Reinsurance, Life Insurance in Force, Net	$ 6,964,537	$ 6,899,364
SEC Schedule, 12-17, Insurance Companies, Reinsurance, Life Insurance in Force, Percentage Assumed to Net	0.10%	0.10%
Direct Premiums Earned	$ 378,936	$ 345,467
Assumed Premiums Earned	689	8,369
Ceded Premiums Earned	58,377	71,570
Premiums Earned, Net	$ 321,248	$ 282,266
SEC Schedule, 12-17, Insurance Companies, Reinsurance, Premium, Percentage Assumed to Net	0.20%	3.00%
Accident and Health Insurance Product Line
Direct Premiums Earned	$ 281,787	$ 249,134
Assumed Premiums Earned	112	7,574
Ceded Premiums Earned	20,632	32,290
Premiums Earned, Net	$ 261,267	$ 224,418
SEC Schedule, 12-17, Insurance Companies, Reinsurance, Premium, Percentage Assumed to Net	0.00%	3.40%
Life and Annuity Insurance Product Line
Direct Premiums Earned	$ 55,303	$ 56,194
Assumed Premiums Earned	577	795
Ceded Premiums Earned	37,360	38,899
Premiums Earned, Net	$ 18,520	$ 18,090
SEC Schedule, 12-17, Insurance Companies, Reinsurance, Premium, Percentage Assumed to Net	3.10%	4.40%
Property, Liability and Casualty Insurance Product Line
Direct Premiums Earned	$ 41,846	$ 40,139
Assumed Premiums Earned	0	0
Ceded Premiums Earned	385	381
Premiums Earned, Net	$ 41,461	$ 39,758
SEC Schedule, 12-17, Insurance Companies, Reinsurance, Premium, Percentage Assumed to Net	0.00%	0.00%