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Market Concentrations (Schedule of Revenues Concentration from Major Customers and Narrative) (Details) - Customer Concentration Risk - customer | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Sales Revenue, Goods, Gross | Customer 1 |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 22.00% | 21.00% | 19.00%
Sales Revenue, Goods, Gross | Customer 2 |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 28.00% | 27.00% | 23.00%
Sales Revenue, Goods, Gross | Customer 3 |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 32.00% | 34.00% | 23.00%
Sales Revenue, Goods, Gross | Customer 4 |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 9.00% | 11.00% | 24.00%
Accounts Receivable |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 71.30% | 91.10% |
Concentration risk, number of major customers exceeding 10 percent threshhold | 4 | 4 |

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