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, 2020	Dec. 31, 2019
SEC Schedule, 12-17, Insurance Companies, Reinsurance, Life Insurance in Force, Gross	$ 15,534,807	$ 14,935,361
SEC Schedule, 12-17, Insurance Companies, Reinsurance, Life Insurance in Force, Assumed	6,003	6,298
SEC Schedule, 12-17, Insurance Companies, Reinsurance, Life Insurance in Force, Ceded	4,842,171	6,553,251
SEC Schedule, 12-17, Insurance Companies, Reinsurance, Life Insurance in Force, Net	$ 10,698,639	$ 8,388,408
SEC Schedule, 12-17, Insurance Companies, Reinsurance, Life Insurance in Force, Percentage Assumed to Net	0.10%	0.10%
Direct Premiums Earned	$ 447,679	$ 393,400
Assumed Premiums Earned	763	1,003
Ceded Premiums Earned	50,912	55,662
Premiums Earned, Net	$ 397,530	$ 338,741
SEC Schedule, 12-17, Insurance Companies, Reinsurance, Premium, Percentage Assumed to Net	0.20%	0.30%
Accident and Health Insurance Product Line
Direct Premiums Earned	$ 305,032	$ 287,529
Assumed Premiums Earned	7	5
Ceded Premiums Earned	23,741	22,538
Premiums Earned, Net	$ 281,298	$ 264,996
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	$ 55,771	$ 54,825
Assumed Premiums Earned	756	998
Ceded Premiums Earned	27,163	33,061
Premiums Earned, Net	$ 29,364	$ 22,762
SEC Schedule, 12-17, Insurance Companies, Reinsurance, Premium, Percentage Assumed to Net	2.60%	4.40%
Property, Liability and Casualty Insurance Product Line
Direct Premiums Earned	$ 86,876	$ 51,046
Assumed Premiums Earned	0	0
Ceded Premiums Earned	8	63
Premiums Earned, Net	$ 86,868	$ 50,983
SEC Schedule, 12-17, Insurance Companies, Reinsurance, Premium, Percentage Assumed to Net	0.00%	0.00%