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Consolidated Statements Of Comprehensive Income (Loss) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Statement of Comprehensive Income [Abstract]        
Foreign currency translation adjustment, tax (benefit) $ 0 $ 251 $ 0 $ 481
Derivative financial instruments adjustment, tax (benefit) (336) 186 (316) 162
Amortization of prior service costs and net gains or losses, tax $ 789 $ 1,057 $ 2,312 $ 3,279