Annual report pursuant to Section 13 and 15(d)

CONSOLIDATED BALANCE SHEETS (Parenthetical)

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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Dec. 31, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Common stock, par value (in dollars per share) $ 1.33 $ 1.33
Common stock, shares authorized (in shares) 100,000,000 100,000,000
Common stock, shares issued (in shares) 43,743,318 43,609,317
Common stock, shares outstanding (in shares) 43,743,318 43,609,317