Summary Of Significant Accounting Policies (Schedule Of Long-Term Investments Measured At Fair Value Using Significant Unobservable Inputs (Level 3 Inputs)) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Fair Value [Abstract]
Balance as of January 1	$ 9,921	$ 10,324
Net unrealized gains included in other comprehensive loss	1,369	418
Sales of investments at par value	(10,282)	(821)
Balance as of December 31	1,008	9,921
Unrealized losses still held as of December 31	$ 64	$ 1,433