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Business Segment, Geographic and Major Customer Information - Major Customers (Details) - segment | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
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 | 12.80% | 12.70% | 11.70% | 17.00%
Customer Concentration Risk [Member] | Customer B [Member] | Sales [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Percentage of revenue by major customers | 11.60% |  |  |
Customer Concentration Risk [Member] | Customer C [Member] | Sales [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Percentage of revenue by major customers | 11.30% |  | 14.30% |
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 |  |  | 97.00% |

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