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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, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Sales Revenue, Goods, Gross | Customer 1 |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 22.00% | 22.00% | 21.00%
Sales Revenue, Goods, Gross | Customer 2 |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 28.00% | 28.00% | 27.00%
Sales Revenue, Goods, Gross | Customer 3 |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 29.00% | 32.00% | 34.00%
Sales Revenue, Goods, Gross | Customer 4 |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 10.00% | 9.00% | 11.00%
Accounts Receivable |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 86.00% | 71.00% |
Concentration risk, number of major customers exceeding 10 percent threshhold | 4 | 4 |

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13537-108611 + Details
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