Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenue:
Life premium	$ 475,110	$ 450,950	$ 945,923	$ 902,828
Health premium	290,584	254,506	604,455	520,950
Other premium	157	126	287	279
Total premium	765,851	705,582	1,550,665	1,424,057
Net investment income	177,964	175,176	354,803	349,297
Realized investment gains (losses)	5,913	4,661	4,684	9,667
Other-than-temporary impairments	0	0	(2,678)	0
Other income	611	376	1,081	697
Total revenue	950,339	885,795	1,908,555	1,783,718
Benefits and expenses:
Life policyholder benefits	310,849	292,784	615,990	583,472
Health policyholder benefits	202,861	181,037	438,988	392,129
Other policyholder benefits	10,789	10,986	21,524	21,853
Total policyholder benefits	524,499	484,807	1,076,502	997,454
Amortization of deferred acquisition costs	102,488	96,601	204,202	193,099
Commissions, premium taxes, and non-deferred acquisition costs	54,448	50,600	112,699	101,356
Other operating expense	55,292	47,758	107,600	95,874
Interest expense	20,828	19,649	41,705	39,320
Total benefits and expenses	757,555	699,415	1,542,708	1,427,103
Income before income taxes	192,784	186,380	365,847	356,615
Income taxes	(58,883)	(57,392)	(112,314)	(108,950)
Net income	$ 133,901	$ 128,988	$ 253,533	$ 247,665
Basic net income per share	$ 1.45	$ 1.33	$ 2.73	$ 2.51
Diluted net income per share	$ 1.44	$ 1.32	$ 2.70	$ 2.48
Dividends declared per common share	$ 0.17	$ 0.15	$ 0.34	$ 0.30