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Consolidated Statements Of Comprehensive Income (Loss) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Statement of Comprehensive Income [Abstract]        
Foreign currency translation adjustment, tax (benefit) $ (270) $ 225 $ (230) $ (1,384)
Derivative financial instruments adjustment, tax (benefit) 442 (591) 598 (990)
Amortization of prior service costs and net gains or losses, tax $ 1,211 $ 1,462 $ 2,066 $ 2,924