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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