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Market Concentrations (Schedule of Revenues Concentration from Major Customers and Narrative) (Details) - Customer Concentration Risk | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Sales Revenue, Goods, Gross | Customer 1 |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 26.00% | 25.00% | 25.00%
Sales Revenue, Goods, Gross | Customer 2 |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 25.00% | 24.00% | 22.00%
Sales Revenue, Goods, Gross | Customer 3 |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 16.00% | 26.00% | 25.00%
Sales Revenue, Goods, Gross | Customer 4 |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 14.00% | 11.00% |
Accounts Receivable |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 72.00% | 78.00% |

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