Revenue (Revenues Disaggregated By Geography And Reportable Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Total net sales	$ 241,877	$ 245,339	$ 699,004	$ 769,679
Functional Coatings [Member]
Disaggregation of Revenue [Line Items]
Total net sales	154,218	154,744	441,325	485,462
Color Solutions [Member]
Disaggregation of Revenue [Line Items]
Total net sales	87,659	90,595	257,679	284,217
EMEA [Member]
Disaggregation of Revenue [Line Items]
Total net sales	95,553	103,397	288,244	329,270
EMEA [Member] | Functional Coatings [Member]
Disaggregation of Revenue [Line Items]
Total net sales	65,081	70,048	192,009	223,310
EMEA [Member] | Color Solutions [Member]
Disaggregation of Revenue [Line Items]
Total net sales	30,472	33,349	96,235	105,960
United States [Member]
Disaggregation of Revenue [Line Items]
Total net sales	86,285	85,415	256,852	275,073
United States [Member] | Functional Coatings [Member]
Disaggregation of Revenue [Line Items]
Total net sales	49,580	46,657	148,468	149,574
United States [Member] | Color Solutions [Member]
Disaggregation of Revenue [Line Items]
Total net sales	36,705	38,758	108,384	125,499
Asia Pacific [Member]
Disaggregation of Revenue [Line Items]
Total net sales	37,545	36,776	99,440	102,210
Asia Pacific [Member] | Functional Coatings [Member]
Disaggregation of Revenue [Line Items]
Total net sales	26,779	26,364	70,268	73,962
Asia Pacific [Member] | Color Solutions [Member]
Disaggregation of Revenue [Line Items]
Total net sales	10,766	10,412	29,172	28,248
Latin America [Member]
Disaggregation of Revenue [Line Items]
Total net sales	22,494	19,751	54,468	63,126
Latin America [Member] | Functional Coatings [Member]
Disaggregation of Revenue [Line Items]
Total net sales	12,778	11,675	30,580	38,616
Latin America [Member] | Color Solutions [Member]
Disaggregation of Revenue [Line Items]
Total net sales	$ 9,716	$ 8,076	$ 23,888	$ 24,510