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Consolidated Statements Of Comprehensive Income (Loss) (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Comprehensive Income [Abstract]      
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax $ (371) $ (729) $ (890)
Derivative financial instruments adjustment, tax (benefit) 111 727 (550)
Net gains or losses and prior service costs, tax (benefit) (2,518) (1,874) (226)
Amortization of prior service costs and net gains or losses, tax $ 4,234 $ 4,398 $ 5,823