Supplemental Cash Flow and Non-Cash Information (Table Of Supplmental Cash Flow Information) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Supplemental Cash Flow Information [Abstract]
Income taxes paid, net	$ 1,674	$ 2,288	$ 6,494	$ 6,144
Interest paid	$ 2,114	$ 448	6,296	1,298
Cash Flow Non-cash Investing And Financing Activities Disclosure [Abstract]
Additions to property, plant and equipment in accounts payable			$ 1,004	$ 1,081