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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Dec. 31, 2016
Dec. 31, 2015
Statement Of Financial Position [Abstract]    
Common stock, par value $ 0.50 $ 0.50
Common stock, shares authorized 75,000,000 75,000,000
Common stock, shares issued 13,937,627 9,544,035
Common stock, shares outstanding 13,937,627 9,544,035