Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue:
Premium	$ 897,484	$ 853,979	$ 1,788,457	$ 1,704,085
Net investment income	227,425	218,568	454,098	436,652
Realized gains (losses)	5,154	11,813	6,483	13,764
Other income	398	416	639	711
Total revenue	1,130,461	1,084,776	2,249,677	2,155,212
Benefits and expenses:
Life policyholder benefits	410,961	399,334	820,653	799,915
Health policyholder benefits	170,511	160,461	340,528	321,080
Other policyholder benefits	7,890	8,582	15,938	17,271
Total policyholder benefits	589,362	568,377	1,177,119	1,138,266
Amortization of deferred acquisition costs	138,165	129,077	273,987	258,697
Commissions, premium taxes, and non-deferred acquisition costs	73,698	69,427	147,163	139,066
Other operating expense	79,044	68,620	151,837	135,444
Interest expense	21,432	22,411	42,710	44,033
Total benefits and expenses	901,701	857,912	1,792,816	1,715,506
Income before income taxes	228,760	226,864	456,861	439,706
Income tax benefit (expense)	(42,151)	(42,471)	(84,858)	(81,602)
Income from continuing operations	186,609	184,393	372,003	358,104
Income (loss) from discontinued operations, net of tax	(43)	32	(92)	(79)
Net income	$ 186,566	$ 184,425	$ 371,911	$ 358,025
Basic net income (loss) per common share:
Continuing operations (in dollars per share)	$ 1.70	$ 1.63	$ 3.38	$ 3.15
Discontinued operations (in dollars per share)	0	0	0	0
Total basic net income per common share (in dollars per share)	1.70	1.63	3.38	3.15
Diluted net income (loss) per common share:
Continuing operations (in dollars per share)	1.67	1.59	3.32	3.08
Discontinued operations (in dollars per share)	0	0	0	0
Total diluted net income per common share (in dollars per share)	$ 1.67	$ 1.59	$ 3.32	$ 3.08
Life premium
Revenue:
Premium	$ 631,201	$ 602,534	$ 1,255,490	$ 1,200,837
Other premium
Revenue:
Premium	266,282	251,440	532,966	503,238
Other premium
Revenue:
Premium	$ 1	$ 5	$ 1	$ 10