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Business Segment, Geographic and Major Customer Information - Major Customers (Details) - segment | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 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 | 19.50% |  | 15.80% |
Customer Concentration Risk [Member] | Customer B [Member] | Sales [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Percentage of revenue by major customers | 12.10% | 17.70% | 11.20% | 19.20%
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 |  |  | 96.00% |

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