Basis Of Presentation And Significant Accounting Policies (Summary Of Financial Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Total	$ 13,992	$ 35,739
Level 1 [Member]
Total	14,071	32,003
Level 2 [Member]
Total	(79)	3,736
Money Market Funds [Member]
Cash equivalents	14,071	32,003
Money Market Funds [Member] | Level 1 [Member]
Cash equivalents	14,071	32,003
Money Market Funds [Member] | Level 2 [Member]
Cash equivalents	0	0
Marketable Securities [Member]
Long-term marketable securities	1,675	1,733
Marketable Securities [Member] | Level 1 [Member]
Long-term marketable securities	0	0
Marketable Securities [Member] | Level 2 [Member]
Long-term marketable securities	1,675	1,733
Derivatives [Member]
Other assets		2,003
Other liabilities	(1,754)
Derivatives [Member] | Level 1 [Member]
Other assets	0	0
Derivatives [Member] | Level 2 [Member]
Other assets		2,003
Other liabilities	$ (1,754)