Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues
Health plan services premiums	$ 10,377,073	$ 10,459,098	$ 9,878,687
Government contracts	572,266	689,121	1,416,619
Net investment income	69,613	82,434	74,161
Administrative services fees and other income	34,791	17,968	11,523
Divested operations and services revenue	0	40,471	34,446
Total revenues	11,053,743	11,289,092	11,415,436
Expenses
Health plan services (excluding depreciation and amortization)	8,886,547	9,316,313	8,539,754
Government contracts	502,918	605,074	1,237,884
General and administrative	1,083,694	939,940	1,052,458
Selling	239,428	245,925	237,562
Depreciation and amortization	38,589	31,146	31,152
Interest	32,614	33,220	32,131
Divested operations and services expenses	0	85,824	163,546
Adjustment to loss on sale of Northeast health plan subsidiaries	0	0	(40,815)
Total expenses	10,783,790	11,257,442	11,253,672
Income (loss) from operations before income taxes	269,953	31,650	161,764
Income tax provision	99,827	5,969	100,708
Income from continuing operations	170,126	25,681	61,056
Discontinued operations:
(Loss) income from discontinued operation, net of tax	0	(18,452)	11,064
Gain on sale of discontinued operation, net of tax	0	114,834	0
Income from discontinued operation, net of tax	0	96,382	11,064
Net income	$ 170,126	$ 122,063	$ 72,120
Net income per share—basic:
Income from continuing operations	$ 2.14	$ 0.31	$ 0.69
Income from discontinued operation, net of tax	$ 0.00	$ 1.18	$ 0.12
Net income per share—basic	$ 2.14	$ 1.49	$ 0.81
Net income per share—diluted:
Income from continuing operations	$ 2.12	$ 0.31	$ 0.68
Income from discontinued operation, net of tax	$ 0.00	$ 1.16	$ 0.12
Net income per share—diluted	$ 2.12	$ 1.47	$ 0.80
Weighted average shares outstanding:
Basic	79,455	82,158	88,524
Diluted	80,404	83,112	89,970