Reportable Segments (Narrative) (Details)	3 Months Ended
	Mar. 31, 2012
Display Technologies [Member]
Segment Reporting Information [Line Items]
Number of customers individually accounting for 10% or more of each segment's sales	4
Percent of total segment sales	80.00%
Telecommunications [Member]
Segment Reporting Information [Line Items]
Number of customers individually accounting for 10% or more of each segment's sales	1
Percent of total segment sales	12.00%
Environmental Technologies [Member]
Segment Reporting Information [Line Items]
Number of customers individually accounting for 10% or more of each segment's sales	3
Percent of total segment sales	88.00%
Specialty Materials [Member]
Segment Reporting Information [Line Items]
Number of customers individually accounting for 10% or more of each segment's sales	2
Percent of total segment sales	50.00%
Life Sciences [Member]
Segment Reporting Information [Line Items]
Number of customers individually accounting for 10% or more of each segment's sales	2
Percent of total segment sales	39.00%