Financial Instruments And Investments (Unrealized Holding Losses Included In Pre-Tax Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Financial Instruments And Investments [Abstract]
Unrealized losses included In pre-tax income	$ 0	$ (166)	$ 0	$ (166)	$ (313)	$ (2,083)