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, 2019	Dec. 31, 2018
SEC Schedule, 12-17, Insurance Companies, Reinsurance, Life Insurance in Force, Gross	$ 14,935,361	$ 14,486,642
SEC Schedule, 12-17, Insurance Companies, Reinsurance, Life Insurance in Force, Assumed	6,298	6,546
SEC Schedule, 12-17, Insurance Companies, Reinsurance, Life Insurance in Force, Ceded	6,553,251	7,528,651
SEC Schedule, 12-17, Insurance Companies, Reinsurance, Life Insurance in Force, Net	$ 8,388,408	$ 6,964,537
SEC Schedule, 12-17, Insurance Companies, Reinsurance, Life Insurance in Force, Percentage Assumed to Net	0.10%	0.10%
Direct Premiums Earned	$ 393,400	$ 378,936
Assumed Premiums Earned	1,003	689
Ceded Premiums Earned	55,662	58,377
Premiums Earned, Net	$ 338,741	$ 321,248
SEC Schedule, 12-17, Insurance Companies, Reinsurance, Premium, Percentage Assumed to Net	0.30%	0.20%
Accident and Health Insurance Product Line
Direct Premiums Earned	$ 287,529	$ 281,787
Assumed Premiums Earned	5	112
Ceded Premiums Earned	22,538	20,632
Premiums Earned, Net	$ 264,996	$ 261,267
SEC Schedule, 12-17, Insurance Companies, Reinsurance, Premium, Percentage Assumed to Net	0.00%	0.00%
Life and Annuity Insurance Product Line
Direct Premiums Earned	$ 54,825	$ 55,303
Assumed Premiums Earned	998	577
Ceded Premiums Earned	33,061	37,360
Premiums Earned, Net	$ 22,762	$ 18,520
SEC Schedule, 12-17, Insurance Companies, Reinsurance, Premium, Percentage Assumed to Net	4.40%	3.10%
Property, Liability and Casualty Insurance Product Line
Direct Premiums Earned	$ 51,046	$ 41,846
Assumed Premiums Earned	0	0
Ceded Premiums Earned	63	385
Premiums Earned, Net	$ 50,983	$ 41,461
SEC Schedule, 12-17, Insurance Companies, Reinsurance, Premium, Percentage Assumed to Net	0.00%	0.00%