DEBT (Tables)

3 Months Ended

Mar. 31, 2012

Debt Disclosure [Abstract]

Schedule of convertible debt

Convertible debt as of March 31, 2012 consists of the following (in thousands): 

March 31, 2012	Outstanding Principal  Amount		Unamortized Debt Discount			Carrying Value
1.25% Convertible Senior Notes due March 2015	$	575,000	$	(71,808	)	$	503,192
1.0% Convertible Senior Notes due March 2018	1,000,000		(133,431		)	866,569
Outstanding convertible debt	$	1,575,000	$	(205,239	)	$	1,369,761

Convertible debt as of December 31, 2011 consisted of the following (in thousands): 

December 31, 2011	Outstanding Principal  Amount		Unamortized Debt Discount			Carrying Value
1.25% Convertible Senior Notes due March 2015	$	575,000	$	(77,360	)	$	497,640