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Taxes on income from continuing operations (Tables)
6 Months Ended
Jun. 30, 2013
Effective Income Tax Rate
     Three Months Ended      Six Months Ended  
     June  30,
2013
     July 1,
2012
     June  30,
2013
     July 1,
2012
 

Effective income tax rate

     12.3%         (0.6)%         16.2%         1.8%