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Consolidated Statements Of Comprehensive Income (Loss) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Statement of Comprehensive Income [Abstract]    
Foreign currency translation adjustment, tax (benefit) $ 0 $ 0
Derivative financial instruments adjustment, tax (benefit) 83 (144)
Amortization of prior service costs and net gains or losses, tax $ 592 $ 762