Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenues
Health plan services premiums	$ 3,261,878	$ 2,578,874	$ 6,143,223	$ 5,210,943
Government contracts	154,083	139,942	298,173	274,454
Net investment income	12,043	17,143	23,145	46,694
Administrative services fees and other income	(6,612)	2,472	(4,214)	3,377
Total revenues	3,421,392	2,738,431	6,460,327	5,535,468
Expenses
Health plan services (excluding depreciation and amortization)	2,763,179	2,191,918	5,165,521	4,460,654
Government contracts	133,208	127,400	265,182	252,875
General and administrative	344,734	291,437	705,757	536,672
Selling	64,002	57,769	128,154	116,330
Depreciation and amortization	9,641	9,514	19,304	18,953
Interest	7,826	8,365	15,647	16,653
Total expenses	3,322,590	2,686,403	6,299,565	5,402,137
Income from operations before income taxes	98,802	52,028	160,762	133,331
Income tax (benefit) provision	(22,065)	18,545	11,108	49,798
Net income	$ 120,867	$ 33,483	$ 149,654	$ 83,533
Net income per share:
Basic	$ 1.51	$ 0.42	$ 1.87	$ 1.05
Diluted	$ 1.49	$ 0.42	$ 1.85	$ 1.04
Weighted average shares outstanding:
Basic	80,250	79,367	80,026	79,438
Diluted	81,218	80,085	81,070	80,287