Consolidated Balance Sheets (USD $) In Thousands	Jun. 30, 2011		Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 459,213		$ 455,886
Investments	356,600		295,375
Receivables	172,674		168,190
Deferred income taxes	16,423		15,716
Prepaid expenses and other current assets	23,246		22,772
Total current assets	1,028,156		957,939
Property and equipment, net	117,836		100,537
Deferred contract costs	42,557		28,444
Intangible assets, net	91,237		105,500
Goodwill and indefinite-lived intangible assets	212,484		212,228
Auction rate securities	18,958		20,449
Restricted investments	50,330		42,100
Receivable for ceded life and annuity contracts	24,075		24,649
Other assets	14,788		17,368
Total assets	1,600,421		1,509,214
Current liabilities:
Medical claims and benefits payable	341,613		354,356
Accounts payable and accrued liabilities	133,005		137,930
Deferred revenue	128,599		60,086
Income taxes payable	5,605		13,176
Total current liabilities	608,822		565,548
Long-term debt	166,725		164,014
Deferred income taxes	14,468		16,235
Liability for ceded life and annuity contracts	24,075		24,649
Other long-term liabilities	20,474		19,711
Total liabilities	834,564		790,157
Stockholders' equity (1):
Common stock, $0.001 par value; 80,000 shares authorized; outstanding: 46,062 shares at June 30, 2011 and 45,463 shares at December 31, 2010	46	[1]	45	[1]
Preferred stock, $0.001 par value; 20,000 shares authorized, no shares issued and outstanding	0		0
Additional paid-in capital	262,988	[1]	251,612	[1]
Accumulated other comprehensive loss	(1,597)		(2,192)
Retained earnings	504,420		469,592
Total stockholders' equity	765,857		719,057
Total liabilities and stockholders' equity	$ 1,600,421		$ 1,509,214

[1] All applicable share and per-share amounts reflect the retroactive effects of the three-for-two common stock split in the form of a stock dividend that was effective May 20, 2011.