Goodwill and Intangible Assets (Changes in Carrying Amount of Goodwill by Segment) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Goodwill [Roll Forward]
December 31, 2017	$ 237,107
Foreign currency translation adjustment	1,945
March 31, 2018	239,052
Advanced Connectivity Solutions
Goodwill [Roll Forward]
December 31, 2017	51,693
Foreign currency translation adjustment	0
March 31, 2018	51,693
Elastomeric Material Solutions
Goodwill [Roll Forward]
December 31, 2017	111,575
Foreign currency translation adjustment	23
March 31, 2018	111,598
Power Electronics Solutions
Goodwill [Roll Forward]
December 31, 2017	71,615
Foreign currency translation adjustment	1,922
March 31, 2018	73,537
Other
Goodwill [Roll Forward]
December 31, 2017	2,224
Foreign currency translation adjustment	0
March 31, 2018	$ 2,224