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Business Segment, Geographic and Major Customer Information - Additional Disclosures (Details) - segment | 3 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015
Segment Reporting Information [Line Items] |  |
Number of reportable segments | 4 |
Customer Concentration Risk [Member] | Customer A [Member] | Sales [Member] |  |
Segment Reporting Information [Line Items] |  |
Percentage of revenue by major customers (percent) | 21.10% | 12.00%
Customer Concentration Risk [Member] | Customer B [Member] | Sales [Member] |  |
Segment Reporting Information [Line Items] |  |
Percentage of revenue by major customers (percent) | 10.90% | 10.30%
Customer Concentration Risk [Member] | Major Customers [Member] | Sales [Member] | Energy Chemistry Technologies [Member] | Minimum [Member] |  |
Segment Reporting Information [Line Items] |  |
Percentage of revenue by major customers (percent) | 94.00% |

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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=64851502&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=73719730&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=64851502&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=73719730&loc=d3e13537-108611 + Details
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