Goodwill and Intangible Assets (Changes in Carrying Amount of Goodwill by Segment) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Goodwill [Roll Forward]
Beginning Balance	$ 105,041
Foreign currency translation adjustment	1,846
Ending Balance	106,887
High Performance Foams [Member]
Goodwill [Roll Forward]
Beginning Balance	23,973
Foreign currency translation adjustment	(159)
Ending Balance	23,814
Printed Circuit Materials [Member]
Goodwill [Roll Forward]
Beginning Balance	0
Foreign currency translation adjustment	0
Ending Balance	0
Curamik Electronics Solutions [Member]
Goodwill [Roll Forward]
Beginning Balance	78,844
Foreign currency translation adjustment	2,005
Ending Balance	80,849
Power Electronics Solutions [Member]
Goodwill [Roll Forward]
Beginning Balance	0
Foreign currency translation adjustment	0
Ending Balance	0
Other [Member]
Goodwill [Roll Forward]
Beginning Balance	2,224
Foreign currency translation adjustment	0
Ending Balance	$ 2,224