Supplemental Cash Flow and Non-Cash Information (Schedule Of Supplemental Cash Flow and Non-Cash Information) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Supplemental Cash Flow Information [Abstract]
Income taxes paid, net	$ 1,605	$ 2,035
Interest paid	2,090	1,939
Non-cash investing activity:
Additions to property, plant and equipment in accounts payable	$ 4,432	$ 7,173