Financial Instruments And Investments (Unrealized Holding Losses Included In Pre-Tax Income) (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
Financial Instruments And Investments
Gross unrealized holding losses included in pre-tax income	$ (199)	$ (263)	$ (199)	$ (263)	$ (199)	$ (705)