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Market Concentrations (Schedule of Revenues Concentration from Major Customers and Narrative) (Details) - Customer Concentration Risk
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Sales Revenue, Goods, Gross | Customer 1      
Concentration Risk [Line Items]      
Concentration risk, percentage 25.00% 31.00% 28.00%
Sales Revenue, Goods, Gross | Customer 2      
Concentration Risk [Line Items]      
Concentration risk, percentage 25.00% 28.00% 25.00%
Sales Revenue, Goods, Gross | Customer 3      
Concentration Risk [Line Items]      
Concentration risk, percentage 21.00% 17.00% 26.00%
Accounts Receivable      
Concentration Risk [Line Items]      
Concentration risk, percentage 60.00% 59.00%