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Consolidated Statements Of Comprehensive Income (Loss) (Parenthetical) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Statement of Comprehensive Income [Abstract]        
Foreign currency translation adjustment, tax (benefit) $ 177,000 $ 0 $ 1,106,000 $ 0
Derivative financial instruments adjustment, tax (benefit) (339,000) 134,000 (887,000) 51,000
Amortization of prior service costs and net gains or losses, tax $ 835,000 $ 593,000 $ 1,671,000 $ 1,185,000