Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Premium	$ 3,421,906	$ 3,282,935	$ 3,137,034
Net investment income	882,512	847,885	806,903
Realized gains (losses)	(1,804)	23,611	(10,683)
Other income	1,137	1,142	1,375
Total revenue	4,303,751	4,155,573	3,934,629
Life policyholder benefits	1,591,790	1,558,261	1,479,272
Health policyholder benefits	649,188	633,778	612,725
Other policyholder benefits	34,264	35,836	36,751
Total policyholder benefits	2,275,242	2,227,875	2,128,748
Amortization of deferred acquisition costs	516,690	490,403	469,063
Commissions, premium taxes, and non-deferred acquisition costs	278,487	264,860	249,174
Other operating expense	279,585	257,255	232,064
Interest expense	90,076	84,532	83,345
Total benefits and expenses	3,440,080	3,324,925	3,162,394
Income before income taxes	863,671	830,648	772,235
Income taxes	(162,161)	627,615	(232,645)
Income from continuing operations	701,510	1,458,263	539,590
Discontinued operations:
Income (loss) from discontinued operations, net of tax	(44)	(3,769)	10,189
Net income	$ 701,466	$ 1,454,494	$ 549,779
Basic net income (loss) per common share:
Continuing operations (in dollars per share)	$ 6.22	$ 12.53	$ 4.50
Discontinued operations (in dollars per share)	0.00	(0.03)	0.08
Total basic net income per common share (in dollars per share)	6.22	12.50	4.58
Diluted net income (loss) per common share:
Continuing operations (in dollars per share)	6.09	12.26	4.41
Discontinued operations (in dollars per share)	0.00	(0.04)	0.08
Total diluted net income per common share (in dollars per share)	$ 6.09	$ 12.22	$ 4.49
Life insurance
Premium	$ 2,406,555	$ 2,306,547	$ 2,189,333
Health premium
Premium	1,015,339	976,373	947,663
Other premium
Premium	$ 12	$ 15	$ 38