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Convertible Notes (Tables)
3 Months Ended
Mar. 31, 2012
Convertible Notes [Abstract]  
Principal Balance, Unamortized Discount And Net Carrying Amount Of The Liability Components And Equity Components
     Liability Component  

March 31, 2012

   Principal
Balance
     Unamortized
Discount
     Net
Carrying
Amount
 
     (In thousands)  

2018 Convertible Notes

   $ 230,000       $ 52,889       $ 177,111