Hedging Activities And Financial Instruments (Narrative) (Details) (USD $)	12 Months Ended			1 Months Ended	12 Months Ended		1 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Nov. 30, 2011 Senior Convertible Notes Due December 15, 2016 [Member]	Dec. 31, 2013 Senior Convertible Notes Due December 15, 2016 [Member]	Dec. 31, 2012 Senior Convertible Notes Due December 15, 2016 [Member]	Dec. 31, 2008 Grand Junction Location [Member]	Dec. 31, 2012 Grand Junction Location [Member]
Consideration received from sale of property, plant and equipment							$ 5,500,000
Proceeds from sale of property and equipment							3,500,000
Interest rate on debt	5.50%			5.50%			0.00%
Term of promissory note							5 years
Decrease in note receivable due to discounted amount							1,017,000
Gain on the disposition of property and equipment	(1,128,000)	674,000	(256,000)				636,000
Fair value discount rate					6.91%	6.67%		13.63%
Principal amount of convertible notes				152,000,000
Debt maturity date				Dec. 15, 2016
Foreign currency gain (loss)	(773,000)	145,000	(118,000)
Foreign currency derivative contracts	$ 0	$ 0