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Restructuring charges (Tables)
12 Months Ended
Dec. 31, 2012
Restructuring Charges
     Workforce
Reduction
 

Restructuring Balance, February 10, 2011

   $ 6,659   

Cash payments

     (6,189

Adjustment

     (403
  

 

 

 

Restructuring Balance, December 31, 2011

   $ 67   

Adjustment

     (67
  

 

 

 

Restructuring Balance, December 31, 2012

   $