Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash flows from operating activities:
Net earnings	$ 262,462	$ 334,728
Adjustments to earnings:
Depreciation and amortization	80,023	69,195
Amortization of stock compensation	17,243	18,515
Provider class action - release	0	(159,300)
Provider class action - deferred tax adjustment	0	58,145
RADV release	(132,977)	0
RADV release - deferred tax adjustment	50,531	0
Changes in assets and liabilities:
Restricted cash - litigation escrow	0	(150,500)
Accounts receivable, net	46,949	12,704
Other receivables, net	(234,773)	(70,824)
Medical liabilities	128,127	40,704
Accounts payable and other accrued liabilities	(94,755)	(15,392)
Deferred revenue	337,983	55,185
Other operating activities	20,726	(6,654)
Net cash from operating activities	481,539	186,506
Cash flows from investing activities:
Capital expenditures, net	(41,129)	(34,995)
Proceeds from sales of investments	704,974	934,657
Proceeds from maturities of investments	129,587	55,215
Purchases of investments	(786,550)	(1,494,113)
Payments for acquisitions, net of cash acquired	(48,480)	(4,000)
Net cash from investing activities	(41,598)	(543,236)
Cash flows from financing activities:
Proceeds from issuance of stock	52,053	37,514
Payments for repurchase of stock	(309,724)	(106,824)
Proceeds from issuance of debt, net	0	590,305
Repayment of debt	(233,903)	(380,029)
Excess tax benefit from stock compensation	6,347	7,392
Payments for cash dividends	(17,746)	0
Net cash from financing activities	(502,973)	148,358
Net change in cash and cash equivalents	(63,032)	(208,372)
Cash and cash equivalents at beginning of period	1,579,003	1,853,988
Cash and cash equivalents at end of period	$ 1,515,971	$ 1,645,616