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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Dec. 31, 2015
Dec. 31, 2014
Common stock, par value $ 1 $ 1
Common stock, shares authorized 50,000,000 50,000,000
Common stock, shares issued 21,381,779 20,499,683
Treasury stock, shares 3,283,638 2,093,464
Undesignated Par Value    
Preferred stock
Preferred stock, shares authorized 1,000,000 1,000,000
Designated Par Value    
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 25,000 25,000
Preferred stock, shares outstanding 0 15,151