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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Mar. 31, 2016
Dec. 31, 2015
Common stock, par value $ 1 $ 1
Common stock, shares authorized 50,000,000 50,000,000
Common stock, shares issued 21,381,779 21,381,779
Treasury stock, shares 3,750,768 3,283,638