Reportable Segments (Narrative) (Details) (USD $)	3 Months Ended	9 Months Ended
	Sep. 30, 2012 customer	Sep. 30, 2012 customer	Dec. 31, 2011
Display Technologies [Member]
Segment Reporting Information [Line Items]
Number of customers individually accounting for 10% or more of each segment's sales	4	4
Percent of total segment sales	77.00%	74.00%
Telecommunications [Member]
Segment Reporting Information [Line Items]
Number of customers individually accounting for 10% or more of each segment's sales	1	1
Percent of total segment sales	12.00%	12.00%
Segment assets	$ 1,400,000,000	$ 1,400,000,000	$ 1,200,000,000
Increase of capital expenditures		$ 170,000,000
Environmental Technologies [Member]
Segment Reporting Information [Line Items]
Number of customers individually accounting for 10% or more of each segment's sales	3	3
Percent of total segment sales	87.00%	87.00%
Specialty Materials [Member]
Segment Reporting Information [Line Items]
Number of customers individually accounting for 10% or more of each segment's sales	2	2
Percent of total segment sales	55.00%	52.00%
Life Sciences [Member]
Segment Reporting Information [Line Items]
Number of customers individually accounting for 10% or more of each segment's sales	2	2
Percent of total segment sales	40.00%	41.00%