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Consolidated Statements Of Comprehensive Income (Loss) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Statement of Comprehensive Income [Abstract]        
Foreign currency translation adjustment, tax (benefit) $ 251 $ (77) $ 481 $ (307)
Derivative financial instruments adjustment, tax (benefit) 186 (31) 162 567
Amortization of prior service costs and net gains or losses, tax $ 1,057 $ 1,120 $ 3,279 $ 3,186