Schedule IV Reinsurance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Life insurance in force
Gross Amount	$ 19,179,823	$ 18,277,691	$ 17,564,270
Ceded to Other Companies	4,813,185	4,505,208	4,295,412
Assumed from Other Companies	0	0	0
Net Amount	$ 14,366,638	$ 13,772,483	$ 13,268,858
Percentage of Amount Assumed to Net	0.00%	0.00%	0.00%
Premiums
Gross Amount	$ 917,610	$ 841,147	$ 812,099
Ceded to Other Companies	30,412	28,837	22,036
Assumed from Other Companies	10,756	5,023	4,640
Net Amount	$ 897,954	$ 817,333	$ 794,703
Percentage of Amount Assumed to Net	1.20%	0.60%	0.60%
Property and Casualty
Premiums
Gross Amount	$ 689,156	$ 682,478	$ 658,960
Ceded to Other Companies	16,457	21,767	15,337
Assumed from Other Companies	10,755	5,023	4,640
Net Amount	$ 683,454	$ 665,734	$ 648,263
Percentage of Amount Assumed to Net	1.60%	0.80%	0.70%
Supplemental
Premiums
Gross Amount	$ 65,918
Ceded to Other Companies	104
Assumed from Other Companies	1
Net Amount	$ 65,815
Percentage of Amount Assumed to Net	0.00%
Retirement
Premiums
Gross Amount	$ 35,602	$ 31,269	$ 28,003
Ceded to Other Companies	6,519	0	0
Assumed from Other Companies	0	0	0
Net Amount	$ 29,083	$ 31,269	$ 28,003
Percentage of Amount Assumed to Net	0.00%	0.00%	0.00%
Life
Premiums
Gross Amount	$ 126,934	$ 127,400	$ 125,136
Ceded to Other Companies	7,332	7,070	6,699
Assumed from Other Companies	0	0	0
Net Amount	$ 119,602	$ 120,330	$ 118,437
Percentage of Amount Assumed to Net	0.00%	0.00%	0.00%