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DEBT (Tables)
 9 Months Ended
Sep. 30, 2013
Debt Disclosure [Abstract]  
Schedule of convertible debt
Convertible debt as of September 30, 2013 consisted of the following (in thousands): 
September 30, 2013
 
Outstanding
 Principal 
Amount
 
Unamortized
 Debt
 Discount
 
Carrying
 Value
1.25% Convertible Senior Notes due March 2015
 
$
574,996

 
$
(36,730
)
 
$
538,266

1.0% Convertible Senior Notes due March 2018
 
1,000,000

 
(102,168
)
 
897,832

0.35% Convertible Senior Notes due June 2020
 
1,000,000

 
(166,805
)
 
833,195

Outstanding convertible debt
 
$
2,574,996

 
$
(305,703
)
 
$
2,269,293

 
Convertible debt as of December 31, 2012 consisted 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