DEBT (Tables)

9 Months Ended

Sep. 30, 2012

Debt Disclosure [Abstract]

Schedule of convertible debt

Convertible debt as of September 30, 2012 consists of the following (in thousands): 

September 30, 2012	Outstanding Principal  Amount		Unamortized Debt Discount			Carrying Value
1.25% Convertible Senior Notes due March 2015	$	574,999	$	(60,457	)	$	514,542
1.0% Convertible Senior Notes due March 2018	1,000,000		(123,191		)	876,809
Outstanding convertible debt	$	1,574,999	$	(183,648	)	$	1,391,351

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