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Consolidated Balance Sheets (Parenthetical) - $ / shares
Mar. 31, 2019
Dec. 31, 2018
Consolidated Balance Sheets    
Common stock, Par value (in dollars per share) $ 1.00 $ 1.00
Common Stock, Shares authorized 60,000,000 60,000,000
Common stock, Shares issued 34,825,340 34,719,517
Common stock, Shares outstanding 29,895,022 29,763,078
Treasury stock, Shares 4,930,318 4,956,439