Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Revenues
Health plan services premiums	$ 4,003,432	$ 3,261,878	$ 7,724,232	$ 6,143,223
Government contracts	141,055	154,083	295,769	298,173
Net investment income	16,424	12,043	29,665	23,145
Administrative services fees and other income	2,712	(6,612)	3,853	(4,214)
Total revenues	4,163,623	3,421,392	8,053,519	6,460,327
Expenses
Health plan services (excluding depreciation and amortization)	3,363,742	2,763,179	6,506,605	5,165,521
Government contracts	137,262	133,208	279,802	265,182
General and administrative	448,713	344,734	902,561	705,757
Selling	69,190	64,002	137,886	128,154
Depreciation and amortization	4,202	9,641	8,509	19,304
Interest	8,412	7,826	16,461	15,647
Asset impairment	0	0	1,884	0
Total expenses	4,031,521	3,322,590	7,853,708	6,299,565
Income from operations before income taxes	132,102	98,802	199,811	160,762
Income tax provision	73,734	(22,065)	111,455	11,108
Net income	$ 58,368	$ 120,867	$ 88,356	$ 149,654
Net income per share:
Basic (usd per share)	$ 0.76	$ 1.51	$ 1.15	$ 1.87
Diluted (usd per share)	$ 0.75	$ 1.49	$ 1.13	$ 1.85
Weighted average shares outstanding:
Basic (shares)	77,172	80,250	77,129	80,026
Diluted (shares)	78,157	81,218	78,264	81,070