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Consolidated Statements Of Comprehensive Income (Loss) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Statement of Comprehensive Income [Abstract]        
Amortization of prior service costs and net gains or losses, tax $ 836 $ 593 $ 2,507 $ 1,778
Foreign currency translation adjustment, tax (benefit) 19 (775) 1,125 (775)
Derivative financial instruments adjustment, tax (benefit) $ 618 $ 75 $ 269 $ 24