Goodwill and Intangible Assets (Changes in Carrying Amount of Goodwill by Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Goodwill [Roll Forward]
Beginning Balance	$ 108,671
Foreign currency translation adjustment	(113)
Ending Balance	108,558
High Performance Foams [Member]
Goodwill [Roll Forward]
Beginning Balance	24,205
Foreign currency translation adjustment	(237)
Ending Balance	23,968
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	124
Ending Balance	82,366
Other [Member]
Goodwill [Roll Forward]
Beginning Balance	2,224
Foreign currency translation adjustment	0
Ending Balance	$ 2,224