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Summary of Significant Accounting Policies Concentration (Details) (Sales Revenue, Goods, Net [Member])
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Concentration Risk [Line Items]      
Concentration Risk, Percentage 10.00% 10.00%  
Geographic Concentration Risk [Member]
     
Concentration Risk [Line Items]      
Concentration Risk, Percentage 13.40% 11.10% 10.90%