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Convertible Subordinated Notes (Tables)
12 Months Ended
Dec. 31, 2011
Convertible Subordinated Notes [Abstract]  
Outstanding balance of convertible subordinated notes
                         
     Semi-Annual
Interest  Payment Dates
     December 31,  
        2011      2010  

3.25% Notes due September 2012

     March 28, September 28       $ 214,955       $ 214,955