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DEBT (Tables)
 3 Months Ended
Mar. 31, 2014
Debt Disclosure [Abstract]  
Schedule of convertible debt
Convertible debt as of March 31, 2014 consisted of the following (in thousands): 
March 31, 2014
 
Outstanding
 Principal 
Amount
 
Unamortized
 Debt
 Discount
 
Carrying
 Value
1.25% Convertible Senior Notes due March 2015
 
$
102,025

 
$
(4,318
)
 
$
97,707

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

 
(91,377
)
 
908,623

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

 
(155,463
)
 
844,537

Outstanding convertible debt
 
$
2,102,025

 
$
(251,158
)
 
$
1,850,867

 
Convertible debt as of December 31, 2013 consisted of the following (in thousands): 
December 31, 2013
 
Outstanding
 Principal 
Amount
 
Unamortized
 Debt
 Discount
 
Carrying
 Value
1.25% Convertible Senior Notes due March 2015
 
$
160,464

 
$
(8,533
)
 
$
151,931

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

 
(96,797
)
 
903,203

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

 
(161,156
)
 
838,844

Outstanding convertible debt
 
$
2,160,464

 
$
(266,486
)
 
$
1,893,978