INVESTMENTS

3 Months Ended

Mar. 31, 2012

Investments, Debt and Equity Securities [Abstract]

INVESTMENTS

INVESTMENTS

The following table summarizes, by major security type, the Company’s short-term investments as of March 31, 2012 (in thousands): 

	Cost		Gross  Unrealized  Gains		Gross  Unrealized Losses			Fair Value
Available for sale securities
Foreign government securities	$	908,136	$	34	$	(87	)	$	908,083
U.S. government securities	1,491,837		91		(205		)	1,491,723
U.S. agency securities	26,812		10		—			26,822
Total	$	2,426,785	$	135	$	(292	)	$	2,426,628

As of March 31, 2012, foreign government securities included investments in debt securities issued by the governments of Germany, the Netherlands, and the United Kingdom. 

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

As of December 31, 2011, foreign government securities included investments in debt securities issued by government of Germany, the Netherlands, the United Kingdom and France.

There were no material realized gains or losses related to investments for the three months ended March 31, 2012 or 2011.