Supplemental Cash Flow And Non-Cash Information (Schedule Of Supplemental Cash Flow Information) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash Flow Non-cash Investing And Financing Activities Disclosure [Abstract]
Additions to property, plant and equipment in accounts payable	$ 2,761	$ 9,113	$ 3,170
Supplemental Cash Flow Information [Abstract]
Income taxes paid (refunded), net	8,561	5,821	62
Interest paid	$ 2,472	$ 1,717	$ 1,757