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Business Segment, Geographic and Major Customer Information - Additional Disclosures (Details) - segment | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Segment Reporting Information [Line Items] |  |  |  |
Number of reportable segments |  |  | 4 |
Customer Concentration Risk | Sales | Customer A |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Percentage of revenue by major customers | 12.90% | 12.80% | 11.90% | 11.70%
Customer Concentration Risk | Sales | Customer B |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Percentage of revenue by major customers | 10.90% | 11.30% | 15.80% | 14.30%
Customer Concentration Risk | Sales | Customer C |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Percentage of revenue by major customers |  | 11.60% |  |
Customer Concentration Risk | Sales | Major Customers | Energy Chemistry Technologies | Minimum |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Percentage of revenue by major customers |  |  | 95.00% |

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