Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
ASSETS
Cash and cash equivalents	$ 279,618	$ 340,110
Investments-available-for-sale (amortized cost: 2013-$1,669,326, 2012-$1,753,931)	1,632,466	1,812,512
Premiums receivable, net of allowance for doubtful accounts (2013-$1,405, 2012-$668)	579,206	373,269
Amounts receivable under government contracts	205,168	228,316
Other receivables	52,283	113,875
Deferred taxes	80,382	51,086
Other assets	119,015	130,796
Total current assets	2,948,138	3,049,964
Property and equipment, net	190,394	183,793
Goodwill	565,886	565,886
Other intangible assets, net	15,556	17,271
Deferred taxes	5,503	13,583
Investments-available-for-sale-noncurrent (amortized cost: 2013-$20,679, 2012-$0)	18,332	0
Other noncurrent assets	137,644	103,893
Total Assets	3,881,453	3,934,390
LIABILITIES AND STOCKHOLDERS’ EQUITY
Reserves for claims and other settlements	1,013,086	1,037,973
Health care and other costs payable under government contracts	76,231	75,649
Unearned premiums	124,205	151,048
Accounts payable and other liabilities	392,647	373,426
Total current liabilities	1,606,169	1,638,096
Senior notes payable	399,197	399,095
Borrowings under revolving credit facility	125,000	100,000
Other noncurrent liabilities	226,863	240,169
Total Liabilities	2,357,229	2,377,360
Commitments and contingencies
Stockholders’ Equity:
Preferred stock ($0.001 par value, 10,000 shares authorized, none issued and outstanding)	0	0
Common stock ($0.001 par value, 350,000 shares authorized; issued 2013-150,052 shares; 2012-148,727 shares )	150	149
Additional paid-in capital	1,360,749	1,329,000
Treasury common stock, at cost (2013-70,655 shares of common stock; 2012-67,426 shares of common stock)	(2,178,121)	(2,092,625)
Retained earnings	2,377,055	2,293,522
Accumulated other comprehensive income	(35,609)	26,984
Total Stockholders’ Equity	1,524,224	1,557,030
Total Liabilities and Stockholders’ Equity	$ 3,881,453	$ 3,934,390