SCHEDULE IV - REINSURANCE (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Life insurance in-force
Gross Amount	$ 765,986,223	$ 751,512,468	$ 739,248,680
Ceded to Other Companies	(302,149,614)	(328,377,398)	(348,994,650)
Assumed from Other Companies	135,407,408	110,205,190	116,265,430
Net Amount	$ 599,244,017	$ 533,340,260	$ 506,519,460
Percentage of Amount Assumed to Net	23.00%	21.00%	23.00%
Premiums and policy fees:
Gross Amount	$ 3,012,542	$ 2,996,646	$ 2,911,275
Ceded to Other Companies	(1,383,510)	(1,367,096)	(1,330,723)
Assumed from Other Companies	643,966	459,716	478,144
Net Amount	2,272,998	2,089,266	2,058,696
Life insurance
Premiums and policy fees:
Gross Amount	2,681,191	2,655,846	2,610,682
Ceded to Other Companies	(1,249,906)	(1,230,258)	(1,207,159)
Assumed from Other Companies	626,283	435,113	454,999
Net Amount	$ 2,057,568	$ 1,860,701	$ 1,858,522
Percentage of Amount Assumed to Net	30.40%	23.40%	24.50%
Annuity policy fees	$ 177,100	$ 173,500	$ 80,100
Accident/health insurance
Premiums and policy fees:
Gross Amount	47,028	51,991	58,076
Ceded to Other Companies	(30,126)	(33,052)	(36,935)
Assumed from Other Companies	12,826	14,946	17,439
Net Amount	$ 29,728	$ 33,885	$ 38,580
Percentage of Amount Assumed to Net	43.10%	44.10%	45.20%
Property and liability insurance
Premiums and policy fees:
Gross Amount	$ 284,323	$ 288,809	$ 242,517
Ceded to Other Companies	(103,478)	(103,786)	(86,629)
Assumed from Other Companies	4,857	9,657	5,706
Net Amount	$ 185,702	$ 194,680	$ 161,594
Percentage of Amount Assumed to Net	2.60%	5.00%	3.50%