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 life insurance in-force	$ 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	$ 3,036,853	$ 3,017,685	$ 2,929,767
Ceded to Other Companies	(1,384,941)	(1,360,735)	(1,314,716)
Assumed from Other Companies	643,992	459,734	478,164
Net Amount	2,295,904	2,116,684	2,093,215
Life insurance
Premiums and policy fees:
Gross Amount	2,681,191	2,655,846	2,610,682
Ceded to Other Companies	(1,173,194)	(1,151,175)	(1,126,915)
Assumed from Other Companies	626,283	435,113	454,999
Net Amount	$ 2,134,280	$ 1,939,784	$ 1,938,766
Percentage of Amount Assumed to Net	29.30%	22.50%	23.50%
Annuity policy fees	$ 177,100	$ 173,500	$ 160,400
Accident/health insurance
Premiums and policy fees:
Gross Amount	47,028	51,991	58,076
Ceded to Other Companies	(30,126)	(33,051)	(36,935)
Assumed from Other Companies	12,826	14,945	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	$ 308,634	$ 309,848	$ 261,009
Ceded to Other Companies	(181,621)	(176,509)	(150,866)
Assumed from Other Companies	4,883	9,676	5,726
Net Amount	$ 131,896	$ 143,015	$ 115,869
Percentage of Amount Assumed to Net	3.70%	6.80%	4.90%