Commitments, Contingencies And Uncertainties (Costs Incurred To Comply With Federal Environment Statutes) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Clean Air Act [Member]
Environmental costs recognized	$ 253	$ 71	$ 293	$ 288	$ 620	$ 505
Clean Water Act [Member]
Environmental costs recognized	$ 53	$ 69	$ 109	$ 103	$ 184	$ 569