DEBT (Tables)

12 Months Ended

Dec. 31, 2012

Debt Disclosure [Abstract]

Schedule of convertible debt

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

December 31, 2012	Outstanding Principal Amount		Unamortized Debt Discount			Carrying Value
1.25% Convertible Senior Notes due March 2015	$	574,999	$	(54,655	)	$	520,344
1.0% Convertible Senior Notes due March 2018	1,000,000		(118,004		)	881,996
Outstanding convertible debt	$	1,574,999	$	(172,659	)	$	1,402,340

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