Commitments, Contingencies And Uncertainties (Costs Incurred To Comply With Federal Environment Statutes) (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Clean Air Act [Member]
Environmental costs recognized	$ 164	$ 88	$ 457	$ 376	$ 696	$ 523
Clean Water Act [Member]
Environmental costs recognized	$ 63	$ 51	$ 172	$ 154	$ 196	$ 305