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Consolidated Statements Of Comprehensive Income (Loss) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Statement of Comprehensive Income [Abstract]        
Foreign currency translation adjustment, tax (benefit) $ 0 $ 173 $ 0 $ 230
Derivative financial instruments adjustment, tax (benefit) 164 (248) 20 (24)
Amortization of prior service costs and net gains or losses, tax $ 761 $ 1,111 $ 1,523 $ 2,222