Sch IV Reinsurance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Direct Premiums, Life Insurance in Force	$ 65,683,485	$ 64,290,040	$ 62,667,310
Ceded Premiums, Life Insurance in Force	13,770,695	14,029,567	14,086,576
Assumed Premiums, Life Insurance in Force	430,583	455,176	487,284
Premiums, Net, Life Insurance in Force	$ 52,343,373	$ 50,715,649	$ 49,068,018
Life Insurance in Force Premiums, Percentage Assumed to Net	0.80%	0.90%	1.00%
Direct Premiums Earned	$ 354,234	$ 351,454	$ 338,968
Ceded Premiums Earned	31,363	32,450	32,922
Assumed Premiums Earned	2,546	2,508	2,637
Premiums Earned, Net	$ 325,417	$ 321,512	$ 308,683
SEC Schedule, 12-17, Insurance Companies, Reinsurance, Premium, Percentage Assumed to Net	0.80%	0.80%	0.90%
Interest sensitive product charges
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Direct Premiums Earned	$ 125,832	$ 121,456	$ 111,616
Ceded Premiums Earned	1,010	1,044	1,021
Assumed Premiums Earned	2,291	2,377	2,341
Premiums Earned, Net	$ 127,113	$ 122,789	$ 112,936
SEC Schedule, 12-17, Insurance Companies, Reinsurance, Premium, Percentage Assumed to Net	1.80%	1.90%	2.10%
Traditional life insurance premiums
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Direct Premiums Earned	$ 222,955	$ 223,960	$ 220,866
Ceded Premiums Earned	25,347	25,779	25,832
Assumed Premiums Earned	255	131	296
Premiums Earned, Net	$ 197,863	$ 198,312	$ 195,330
SEC Schedule, 12-17, Insurance Companies, Reinsurance, Premium, Percentage Assumed to Net	0.10%	0.10%	0.20%
Accident and health premiums
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Direct Premiums Earned	$ 5,447	$ 6,038	$ 6,486
Ceded Premiums Earned	5,006	5,627	6,069
Assumed Premiums Earned	0	0	0
Premiums Earned, Net	$ 441	$ 411	$ 417
SEC Schedule, 12-17, Insurance Companies, Reinsurance, Premium, Percentage Assumed to Net	0.00%	0.00%	0.00%