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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Jun. 30, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Preferred Stock, shares authorized (shares) 500,000 500,000
Preferred Stock, shares issued (shares) 0 0
Common Stock, stated value (USD per share) $ 1 $ 1
Common Stock, shares authorized (shares) 45,000,000 45,000,000