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Convertible Senior Notes due 2016 (Tables)
 6 Months Ended
Jun. 30, 2011
Convertible Senior Notes due 2016 [Abstract]  
Net carrying amount of the debt component
         
    June 30,2011
    (In thousands)
Carrying amount of the equity component
  $ 89,468  
Net carrying amount of the liability component
  $ 68,177  
Unamortized discount of the liability component
  $ 72,355