INVESTMENTS

12 Months Ended

Dec. 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 December 31, 2012 (in thousands):

	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Foreign government securities	$	1,886,822	$	18	$	(287	)	$	1,886,553
U.S. government securities	1,759,773		520		(1		)	1,760,292
Total	$	3,646,595	$	538	$	(288	)	$	3,646,845

As of December 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
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

There were no material realized gains or losses related to investments for the years ended December 31, 2012, 2011 and 2010.