Reporting For Segments (Summary of Segment's Expenditures for Long-Lived Assets) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Total expenditures for long lived assets	[1]	$ 64,970	$ 80,619	$ 50,552
Performance Colors And Glass [Member] | Discontinued Operations [Member]
Segment Reporting Information [Line Items]
Total expenditures for long lived assets		10,100	5,300	4,700
Corporate Restructuring Charges [Member]
Segment Reporting Information [Line Items]
Total expenditures for long lived assets		2,069	5,715	1,088
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total expenditures for long lived assets		62,901	74,904	49,464
Operating Segments [Member] | Performance Colors And Glass [Member]
Segment Reporting Information [Line Items]
Total expenditures for long lived assets		46,304	49,964	29,108
Operating Segments [Member] | Color Solutions [Member]
Segment Reporting Information [Line Items]
Total expenditures for long lived assets		$ 16,597	$ 24,940	$ 20,356

[1] Includes capital expenditures for discontinued operation of $10.1 million, $5.3 million and $4.7 million in 2019, 2018 and 2017, respectively, integrated within Performance Colors and Glass.