Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
ASSETS
Cash and cash equivalents	$ 737,024	$ 433,155
Investments-available-for-sale (amortized cost: 2014-$1,699,933, 2013-$1,602,456)	1,685,009	1,567,020
Premiums receivable, net of allowance for doubtful accounts (2014-$772, 2013-$643)	450,224	430,012
Amounts receivable under government contracts	188,843	194,041
Other receivables	54,251	68,919
Deferred taxes	75,321	94,060
Other assets	254,702	132,683
Total current assets	3,445,374	2,919,890
Property and equipment, net	206,410	201,395
Goodwill	565,886	565,886
Other intangible assets, net	13,949	13,842
Deferred taxes	4,195	5,793
Investments-available-for-sale-noncurrent (amortized cost: 2014-$4,861, 2013-$67,943)	4,255	59,768
Other noncurrent assets	190,550	162,551
Total Assets	4,430,619	3,929,125
LIABILITIES AND STOCKHOLDERS’ EQUITY
Reserves for claims and other settlements	1,151,958	984,075
Health care and other costs payable under government contracts	80,232	72,098
Unearned premiums	127,593	123,969
Accounts payable and other liabilities	669,406	397,036
Total current liabilities	2,029,189	1,577,178
Senior notes payable	399,351	399,300
Borrowings under revolving credit facility	100,000	100,000
Deferred taxes	18,057	10,409
Other noncurrent liabilities	205,521	213,427
Total Liabilities	2,752,118	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 2014-151,442 shares; 2013-150,224 shares)	152	150
Additional paid-in capital	1,397,962	1,377,624
Treasury common stock, at cost (2014-71,242 shares of common stock; 2013-70,704 shares of common stock)	(2,197,538)	(2,179,744)
Retained earnings	2,492,435	2,463,648
Accumulated other comprehensive loss	(14,510)	(32,867)
Total Stockholders’ Equity	1,678,501	1,628,811
Total Liabilities and Stockholders’ Equity	$ 4,430,619	$ 3,929,125