CONDENSED CONSOLIDATED INCOME STATEMENTS (Unaudited) (USD $) In Thousands, except Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Revenues:
Premium	$ 1,523,433	$ 1,428,879	$ 3,059,228	$ 2,795,646
Investment income and other	4,001	8,634	8,121	13,516
Total revenues	1,527,434	1,437,513	3,067,349	2,809,162
Expenses:
Health benefits	1,281,760	1,176,445	2,538,722	2,318,017
Selling, general and administrative	122,289	108,189	238,748	225,612
Premium tax	40,439	33,172	80,887	64,644
Depreciation and amortization	9,332	8,905	18,422	17,615
Interest	4,170	4,019	8,349	8,009
Total expenses	1,457,990	1,330,730	2,885,128	2,633,897
Income before income taxes	69,444	106,783	182,221	175,265
Income tax expense	25,150	39,570	67,450	65,870
Net income	$ 44,294	$ 67,213	$ 114,771	$ 109,395
Net income per share:
Basic net income per share	$ 0.91	$ 1.34	$ 2.37	$ 2.17
Weighted average number of common shares outstanding	48,419,556	50,296,209	48,342,756	50,422,564
Diluted net income per share	$ 0.83	$ 1.31	$ 2.18	$ 2.14
Weighted average number of common shares and dilutive potential common shares outstanding	53,541,368	51,318,044	52,658,303	51,235,939