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%