Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenue:
Life premium	$ 576,223	$ 546,415	$ 1,725,896	$ 1,639,156
Health premium	242,991	236,987	730,557	709,936
Other premium	3	9	9	34
Total premium	819,217	783,411	2,456,462	2,349,126
Net investment income	213,872	202,720	634,930	601,415
Realized investment gains (losses)	12,595	3,482	6,142	7,780
Other income	331	160	1,140	963
Total revenue	1,046,015	989,773	3,098,674	2,959,284
Benefits and expenses:
Life policyholder benefits	386,445	369,546	1,168,383	1,101,748
Health policyholder benefits	155,774	153,351	470,104	459,387
Other policyholder benefits	9,000	9,255	26,923	27,475
Total policyholder benefits	551,219	532,152	1,665,410	1,588,610
Amortization of deferred acquisition costs	122,334	116,821	370,363	352,872
Commissions, premium taxes, and non-deferred acquisition costs	67,863	61,153	198,011	185,609
Other operating expense	63,019	57,805	187,788	173,080
Interest expense	20,970	20,381	62,825	62,860
Total benefits and expenses	825,405	788,312	2,484,397	2,363,031
Income before income taxes	220,610	201,461	614,277	596,253
Income taxes	(67,264)	(59,551)	(183,390)	(181,475)
Income from continuing operations	153,346	141,910	430,887	414,778
Income (loss) from discontinued operations, net of tax	(12)	9,959	(3,739)	(447)
Net income	$ 153,334	$ 151,869	$ 427,148	$ 414,331
Basic net income (loss) per common share:
Continuing operations (in dollars per share)	$ 1.32	$ 1.19	$ 3.69	$ 3.44
Discontinued operations (in dollars per share)	0.00	0.08	(0.03)	0.00
Total basic net income per common share (in dollars per share)	1.32	1.27	3.66	3.44
Diluted net income (loss) per common share:
Continuing operations (in dollars per share)	1.29	1.16	3.61	3.38
Discontinued operations (in dollars per share)	0.00	0.09	(0.03)	0.00
Total diluted net income per common share (in dollars per share)	1.29	1.25	3.58	3.38
Dividends declared per common share (in dollars per share)	$ 0.15	$ 0.14	$ 0.45	$ 0.42