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Consolidated Statements Of Comprehensive Income (Loss) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Statement of Comprehensive Income [Abstract]        
Foreign currency translation adjustment, tax (benefit) $ 173 $ 270 $ 230 $ (230)
Derivative financial instruments adjustment, tax (benefit) (248) (442) (24) 598
Amortization of prior service costs and net gains or losses, tax $ 1,111 $ 1,211 $ 2,222 $ 2,066