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Income Taxes (Details 5)
12 Months Ended
Dec. 31, 2013
United States | Minimum
 
Income Tax Examination [Line Items]  
Income Tax Examination, Year under Examination 2007
United States | Maximum
 
Income Tax Examination [Line Items]  
Income Tax Examination, Year under Examination 2013
State of Wisconsin | Minimum
 
Income Tax Examination [Line Items]  
Income Tax Examination, Year under Examination 2009
State of Wisconsin | Maximum
 
Income Tax Examination [Line Items]  
Income Tax Examination, Year under Examination 2013
CHINA | Minimum
 
Income Tax Examination [Line Items]  
Income Tax Examination, Year under Examination 2005
CHINA | Maximum
 
Income Tax Examination [Line Items]  
Income Tax Examination, Year under Examination 2013
France | Minimum
 
Income Tax Examination [Line Items]  
Income Tax Examination, Year under Examination 2009
France | Maximum
 
Income Tax Examination [Line Items]  
Income Tax Examination, Year under Examination 2013
GERMANY | Minimum
 
Income Tax Examination [Line Items]  
Income Tax Examination, Year under Examination 2006
GERMANY | Maximum
 
Income Tax Examination [Line Items]  
Income Tax Examination, Year under Examination 2013