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Consolidated Statements Of Comprehensive Income (Parenthetical) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Consolidated Statements Of Comprehensive Income [Abstract]      
Foreign currency translation adjustment, (benefit) tax $ 897 $ (505) $ (1,443)
Reclassification adjustment of foreign currency translation gain included in income, tax    1,497   
Derivative financial instruments adjustment, tax (benefit) 818 (423) (287)
Net gains or losses and prior service costs, benefit (11,145) (20,032) (2,135)
Amortization of prior service costs and net gains or losses, tax $ 3,749 $ 2,232 $ 1,732