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Summary of Significant Accounting Policies (Concentration) (Details) - Customers
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Consolidated net sales      
Concentration Risk [Line Items]      
Concentration risk 10.00% 10.00%  
Number of customers that exceeded threshold 0 0  
Accounts receivable      
Concentration Risk [Line Items]      
Concentration risk 10.00% 10.00%  
Number of customers that exceeded threshold 0 0  
Foreign sales | Consolidated net sales      
Concentration Risk [Line Items]      
Concentration risk 18.10% 15.60% 13.60%