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Consolidated Statement of Changes in Retained Earnings and Accumulated Other Comprehensive Loss (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Accumulated Other Comprehensive (Loss)        
Tax on pension and post-retirement plan adjustments $ 614 $ 935 $ 1,682 $ 2,043