Business Segment, Geographic and Major Customer Information (Major Customers) (Details) (Customer Concentration Risk [Member], Sales Revenue, Net [Member])	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Customer A [Member]
Revenue, Major Customer [Line Items]
Concentration risk, percentage	16.10%	16.20%	15.60%
Customer B [Member]
Revenue, Major Customer [Line Items]
Concentration risk, percentage			10.00%
Energy Chemical Technologies [Member] | Major Customers [Member]
Revenue, Major Customer [Line Items]
Concentration risk, percentage	94.00%	95.00%	95.00%