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Business Segment, Geographic and Major Customer Information (Major Customers) (Details) - Customer Concentration Risk - Sales Revenue, Net
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
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 15.70% 17.20% 9.90%
Customer B      
Revenue, Major Customer [Line Items]      
Concentration risk, percentage 13.20% 14.60% 22.10%
Customer C      
Revenue, Major Customer [Line Items]      
Concentration risk, percentage 6.90% 10.60% 2.10%