Goodwill And Other Intangible Assets (Details And Activity Of Goodwill By Segment) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill, net at beginning	$ 172,209
Foreign currency adjustment	1,032
Goodwill, net at ending	173,241
Functional Coatings [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill, net at beginning	121,902
Foreign currency adjustment	335
Goodwill, net at ending	122,237
Color Solutions [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill, net at beginning	50,307
Foreign currency adjustment	697
Goodwill, net at ending	$ 51,004