Significant Customers, Geographic Areas, And Business Segments (Summary Of Certain Significant Customer Information) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Product Information [Line Items]
Export sales	$ 8,552	$ 8,726	$ 9,317	$ 6,713	$ 5,803	$ 11,558	$ 13,003	$ 11,280	$ 33,308	$ 41,644
Significant Customer A [Member]
Product Information [Line Items]
Export sales									5,870	5,428
Percentage of Revenues									18.00%	13.00%
Significant Customer B [Member]
Product Information [Line Items]
Export sales									$ 2,257	$ 4,886
Percentage of Revenues									7.00%	12.00%