Schedule IV Reinsurance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Life insurance in force
Gross Amount	$ 19,821,228	$ 19,179,823	$ 18,277,691
Ceded to Other Companies	4,619,083	4,813,185	4,505,208
Assumed from Other Companies	0	0	0
Net Amount	$ 15,202,145	$ 14,366,638	$ 13,772,483
Percentage of Amount Assumed to Net	0.00%	0.00%	0.00%
Premiums
Gross Amount	$ 949,525	$ 917,610	$ 841,147
Ceded to Other Companies	28,757	30,412	28,837
Assumed from Other Companies	9,929	10,756	5,023
Net Amount	$ 930,697	$ 897,954	$ 817,333
Percentage of Amount Assumed to Net	1.10%	1.20%	0.60%
Property and Casualty
Premiums
Gross Amount	$ 652,884	$ 689,156	$ 682,478
Ceded to Other Companies	12,635	16,457	21,767
Assumed from Other Companies	9,919	10,755	5,023
Net Amount	$ 650,168	$ 683,454	$ 665,734
Percentage of Amount Assumed to Net	1.50%	1.60%	0.80%
Supplemental
Premiums
Gross Amount	$ 130,936	$ 65,918
Ceded to Other Companies	252	104
Assumed from Other Companies	10	1
Net Amount	$ 130,694	$ 65,815
Percentage of Amount Assumed to Net	0.00%	0.00%
Retirement
Premiums
Gross Amount	$ 37,977	$ 35,602	$ 31,269
Ceded to Other Companies	8,328	6,519	0
Assumed from Other Companies	0	0	0
Net Amount	$ 29,649	$ 29,083	$ 31,269
Percentage of Amount Assumed to Net	0.00%	0.00%	0.00%
Life
Premiums
Gross Amount	$ 127,728	$ 126,934	$ 127,400
Ceded to Other Companies	7,542	7,332	7,070
Assumed from Other Companies	0	0	0
Net Amount	$ 120,186	$ 119,602	$ 120,330
Percentage of Amount Assumed to Net	0.00%	0.00%	0.00%