Supplemental Cash Flow And Non-Cash Information (Schedule Of Supplemental Cash Flow Information) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash Flow Non-cash Investing And Financing Activities Disclosure [Abstract]
Additions to property, plant and equipment in accounts payable	$ 9,113	$ 3,170	$ 2,020
Supplemental Cash Flow Information [Abstract]
Income taxes paid, net	5,821	62	11,975
Interest paid	$ 1,717	$ 1,757	$ 1,353