INVESTMENTS (Tables)

6 Months Ended

Jun. 30, 2012

Investments, Debt and Equity Securities [Abstract]

Short-term investments

The following table summarizes, by major security type, the Company’s short-term investments as of December 31, 2011 (in thousands): 

	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Available for sale securities
Foreign government securities	$	1,073,731	$	588	$	(133	)	$	1,074,186
U.S. government securities	922,997		353		(28		)	923,322
U.S. agency securities	26,942		9		—			26,951
U.S. corporate notes	205		163		—			368
Total	$	2,023,875	$	1,113	$	(161	)	$	2,024,827

The following table summarizes, by major security type, the Company’s short-term investments as of June 30, 2012 (in thousands): 

	Cost		Gross  Unrealized  Gains		Gross  Unrealized Losses			Fair Value
Available for sale securities
Foreign government securities	$	1,155,626	$	22	$	(58	)	$	1,155,590
U.S. government securities	1,952,426		50		(211		)	1,952,265
U.S. agency securities	21,699		2		—			21,701
Total	$	3,129,751	$	74	$	(269	)	$	3,129,556