Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current Assets:
Cash and cash equivalents	$ 869,133	$ 433,155
Investments-available-for-sale (amortized cost: 2014-$1,777,404, 2013-$1,602,456)	1,791,060	1,567,020
Premiums receivable, net of allowance for doubtful accounts (2014-$1,671, 2013-$643)	951,935	430,012
Amounts receivable under government contracts	150,546	194,041
Other receivables	424,910	68,919
Deferred taxes	57,911	94,060
Assets held for sale	50,000	0
Other assets	220,122	132,683
Total current assets	4,515,617	2,919,890
Property and equipment, net	84,328	201,395
Goodwill	558,886	565,886
Other intangible assets, net	11,822	13,842
Deferred taxes	33,081	5,793
Investments-available-for-sale-noncurrent (amortized cost: 2014-$5,474, 2013-$67,943)	4,570	59,768
Other noncurrent assets	187,630	162,551
Total Assets	5,395,934	3,929,125
Current Liabilities:
Reserves for claims and other settlements	1,896,035	984,075
Health care and other costs payable under government contracts	71,988	72,098
Unearned premiums	96,106	123,969
Accounts payable and other liabilities	880,374	397,036
Total current liabilities	2,944,503	1,577,178
Senior notes payable	399,504	399,300
Borrowings under revolving credit facility	100,000	100,000
Deferred taxes	0	10,409
Other noncurrent liabilities	242,705	213,427
Total Liabilities	3,686,712	2,300,314
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 2014-152,451 shares; 2013-150,224 shares)	153	150
Additional paid-in capital	1,444,705	1,377,624
Treasury common stock, at cost (2014-74,378 shares of common stock; 2013-70,704 shares of common stock)	(2,341,652)	(2,179,744)
Retained earnings	2,609,277	2,463,648
Accumulated other comprehensive income	(3,261)	(32,867)
Total Stockholders’ Equity	1,709,222	1,628,811
Total Liabilities and Stockholders’ Equity	$ 5,395,934	$ 3,929,125