Financial Instruments And Investments (Unrealized Holding Losses Included In Pre-Tax Income) (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
Financial Instruments And Investments [Abstract]
Gross unrealized holding losses included In pre-tax income	$ (1,547)	$ 0	$ (1,746)	$ (263)	$ (1,746)	$ (408)