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Senior Convertible Notes (Tables)
 6 Months Ended
Jun. 30, 2014
Debt Disclosure [Abstract]  
Net carrying amount of the debt component
The carrying values of the Company’s Senior Convertible Notes are as follows (in thousands):
 
June 30, 2014
 
December 31, 2013
2.75% Senior Convertible Notes due 2017:
 
 
 
Principal amount
$
402,500

 
$
402,500

Unamortized debt discount
(49,231
)
 
(56,440
)
Senior Convertible Notes due 2017, net of unamortized discount
$
353,269

 
$
346,060