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Accumulated Other Comprehensive Loss, Net Of Taxes (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Accumulated Other Comprehensive Loss, Net Of Taxes [Abstract]      
Accumulated gains (losses) on derivative instruments $ (10,114) $ 9,911 $ 3,243
Accumulated foreign currency translation differences (7,161) (1,564) (4,555)
Accumulated unrealized losses on available for sale securities (1,553) (5,216) (2,291)
Unrealized pension losses (37,398) (21,591) (18,810)
Accumulated other comprehensive loss $ (56,226) $ (18,460) $ (22,413)