Fair Value (Schedule Of Long-Term Investments Measured At Fair Value) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Fair Value [Abstract]
Balance as of Period Start	$ 10,324	$ 24,673
Net unrealized gains included in other comprehensive loss	318	351
Sales of investments at par value	(25)	(11,025)
Balance as of Period End	10,617	13,999
Unrealized Losses Still Held at September 30	$ 1,533	$ 2,976