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Unaudited Condensed Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Statement of Comprehensive Income [Abstract]        
Reclassification of pension and postretirement adjustments into earnings, tax expense (benefit) $ (21) $ (26) $ (45) $ (61)