Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
ASSETS
Cash and cash equivalents	$ 1,018,353	$ 869,133
Investments-available-for-sale (amortized cost: 2015-$2,490,857, 2014-$1,777,404)	2,520,429	1,791,060
Premiums receivable, net of allowance for doubtful accounts (2015-$2,504, 2014-$1,671)	299,286	951,935
Amounts receivable under government contracts	229,227	150,546
Other receivables	367,135	424,910
Deferred taxes	55,529	57,911
Assets held for sale	50,000	50,000
Other assets	348,240	220,122
Total current assets	4,888,199	4,515,617
Property and equipment, net	84,095	84,328
Goodwill	558,886	558,886
Other intangible assets, net	11,119	11,822
Deferred taxes	42,449	33,081
Investments-available-for-sale-noncurrent (amortized cost: 2015-$7,471, 2014-$5,474)	6,328	4,570
Other noncurrent assets	288,954	187,630
Total Assets	5,880,030	5,395,934
LIABILITIES AND STOCKHOLDERS’ EQUITY
Reserves for claims and other settlements	1,913,778	1,896,035
Health care and other costs payable under government contracts	80,831	71,988
Unearned premiums	160,597	96,106
Accounts payable and other liabilities	1,180,454	880,374
Total current liabilities	3,335,660	2,944,503
Senior notes payable	399,556	399,504
Borrowings under revolving credit facility	195,000	100,000
Other noncurrent liabilities	290,714	242,705
Total Liabilities	4,220,930	3,686,712
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 2015- 153,483 shares; 2014-152,451 shares)	154	153
Additional paid-in capital	1,465,793	1,444,705
Treasury common stock, at cost (2015-76,434 shares of common stock; 2014-74,378 shares of common stock)	(2,453,410)	(2,341,652)
Retained earnings	2,639,265	2,609,277
Accumulated other comprehensive income (loss)	7,298	(3,261)
Total Stockholders’ Equity	1,659,100	1,709,222
Total Liabilities and Stockholders’ Equity	$ 5,880,030	$ 5,395,934