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Consolidated Statements Of Comprehensive Income (Loss) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Statement of Comprehensive Income [Abstract]        
Foreign currency translation adjustment, tax (benefit) $ (77) $ (122) $ (307) $ (1,506)
Derivative financial instruments adjustment, tax (benefit) (31) (92) 567 (1,082)
Amortization of prior service costs and net gains or losses, tax $ 1,120 $ 1,478 $ 3,186 $ 4,402