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, 2013	Dec. 31, 2012
Summary Of Significant Accounting Policies [Abstract]
Balance as of January 1	$ 10,324	$ 24,673
Net unrealized gains included in other comprehensive income	418	1,476
Sales of investments at par value	(821)	(15,825)
Balance as of December 31	9,921	10,324
Unrealized losses still held	$ 1,433	$ 1,851