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CONSOLIDATED STATEMENT OF SHAREHOLDERS EQUITY (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Statement of Stockholders' Equity [Abstract]        
Tax effect of gain (losses) on derivatives qualifying as hedges $ 342 $ 1,463 $ 387 $ 1,357
Tax effect of pension liability and postretirement adjustment $ 1,937 $ 4,499 $ 1,101 $ 2,605
Cash dividends declared, per share $ 0.73 $ 0.69 $ 1.46 $ 1.38