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, 2012	Dec. 31, 2011	Dec. 31, 2010
Supplemental Cash Flow And Non-Cash Information [Abstract]
Income taxes paid, net	$ 11,975	$ 7,759	$ 8,577
Interest paid	1,353	1,290	1,324
Non-cash investing activity:
Additions to property, plant and equipment in accounts payable	$ 2,020