Supplemental Cash Flow and Non-Cash Information (Schedule Of Supplemental Cash Flow and Non-Cash Information) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Supplemental Cash Flow Information [Abstract]
Income taxes paid, net	$ 7,768	$ 932	$ 9,373	$ 2,967
Interest paid	$ 1,992	$ 2,488	4,082	4,427
Non-cash investing activity:
Additions to property, plant and equipment in accounts payable			$ 8,902	$ 3,677