Goodwill and Intangible Assets (Changes in Carrying Amount of Goodwill by Segment) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014
Goodwill [Roll Forward]
Beginning Balance	$ 108,671
Foreign currency translation adjustment	(6,995)
Ending Balance	101,676
High Performance Foams [Member]
Goodwill [Roll Forward]
Beginning Balance	24,205
Foreign currency translation adjustment	(86)
Ending Balance	24,119
Printed Circuit Materials [Member]
Goodwill [Roll Forward]
Beginning Balance	0
Foreign currency translation adjustment	0
Ending Balance	0
Power Electronics Solutions [Member]
Goodwill [Roll Forward]
Beginning Balance	82,242
Foreign currency translation adjustment	(6,909)
Ending Balance	75,333
Other [Member]
Goodwill [Roll Forward]
Beginning Balance	2,224
Foreign currency translation adjustment	0
Ending Balance	$ 2,224