Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 1,399,162	$ 1,579,003
Short-term investments	121,742	116,205
Accounts receivable, net of allowance of $3,336 and $4,716 as of December 31, 2012 and 2011, respectively	272,077	270,263
Other receivables, net	892,815	717,736
Other current assets	196,323	286,301
Total current assets	2,882,119	2,969,508
Long-term investments	2,658,582	2,635,309
Property and equipment, net	266,818	255,485
Goodwill	2,591,488	2,548,834
Other intangible assets, net	318,592	367,533
Other long-term assets	33,389	36,863
Total assets	8,750,988	8,813,532
Current liabilities:
Medical liabilities	1,418,914	1,308,507
Accounts payable and other accrued liabilities	488,175	695,235
Deferred revenue	137,981	114,510
Current portion of long-term debt	0	233,903
Total current liabilities	2,045,070	2,352,155
Long-term debt	1,585,190	1,584,700
Other long-term liabilities	397,813	365,686
Total liabilities	4,028,073	4,302,541
Stockholders’ equity:
Common stock, $.01 par value; 570,000 authorized 197,080 issued and 134,573 outstanding in 2012 193,469 issued and 141,172 outstanding in 2011	1,971	1,935
Treasury stock, at cost; 62,507 in 2012; 52,297 in 2011	(1,920,749)	(1,583,313)
Additional paid-in capital	1,970,877	1,848,995
Accumulated other comprehensive income, net	69,220	60,469
Retained earnings	4,601,596	4,182,905
Total stockholders’ equity	4,722,915	4,510,991
Total liabilities and stockholders’ equity	$ 8,750,988	$ 8,813,532