Consolidated Balance Sheets (USD $) In Thousands	Sep. 30, 2011		Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 487,492		$ 455,886
Investments	324,902		295,375
Receivables	180,039		168,190
Income tax refundable	5,781		0
Deferred income taxes	14,096		15,716
Prepaid expenses and other current assets	22,285		22,772
Total current assets	1,034,595		957,939
Property and equipment, net	127,657		100,537
Deferred contract costs	52,839		28,444
Intangible assets, net	84,495		105,500
Goodwill and indefinite-lived intangible assets	212,484		212,228
Auction rate securities	18,112		20,449
Restricted investments	50,494		42,100
Receivable for ceded life and annuity contracts	23,696		24,649
Other assets	13,932		17,368
Total assets	1,618,304		1,509,214
Current liabilities:
Medical claims and benefits payable	361,055		354,356
Accounts payable and accrued liabilities	141,688		137,930
Deferred revenue	101,701		60,086
Income taxes payable	0		13,176
Total current liabilities	604,444		565,548
Long-term debt	168,109		164,014
Deferred income taxes	22,948		16,235
Liability for ceded life and annuity contracts	23,696		24,649
Other long-term liabilities	17,287		19,711
Total liabilities	836,484		790,157
Stockholders' equity (1):
Common stock, $0.001 par value; 80,000 shares authorized; outstanding: 45,690 shares at September 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
Additional paid-in capital	260,166	[1]	251,612	[1]
Accumulated other comprehensive loss	(1,762)		(2,192)
Retained earnings	523,370		469,592
Total stockholders' equity	781,820		719,057
Total liabilities and stockholders' equity	$ 1,618,304		$ 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.