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Business Segment, Geographic and Major Customer Information (Major Customers) (Details) - Customer Concentration Risk - Sales Revenue, Net | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Major Customers [Member] | Energy Chemistry Technologies |  |  |
Revenue, Major Customer [Line Items] |  |  |
Concentration risk, percentage | 95.00% | 95.00% | 95.00%
Customer A |  |  |
Revenue, Major Customer [Line Items] |  |  |
Concentration risk, percentage | 12.80% | 15.70% | 17.20%
Customer B |  |  |
Revenue, Major Customer [Line Items] |  |  |
Concentration risk, percentage | 8.90% | 13.20% | 14.60%
Customer C |  |  |
Revenue, Major Customer [Line Items] |  |  |
Concentration risk, percentage | 4.00% | 6.90% | 10.60%

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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=84177426&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=77997519&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=84177426&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=77997519&loc=d3e13537-108611 + Details
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