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Significant Accounting Policies (Changes In Accumulated Other Comprehensive Income By Components) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Significant Accounting Policies [Abstract]    
Foreign currency translation differences $ (5,189) $ (7,161)
Unrealized gains (losses) on derivative instruments 14,771 (10,114)
Pension and post-retirement benefit plans (42,354) (37,398)
Unrealized gains (losses) on available-for-sale marketable securities (772) (1,553)
Accumulated other comprehensive loss $ (33,544) $ (56,226)