CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
CONDENSED CONSOLIDATED BALANCE SHEETS [Abstract]
Common stock, par value	$ 1	$ 1	$ 1
Common stock, shares authorized	480,000,000	480,000,000	480,000,000
Common stock, shares outstanding	132,290,000	132,324,000	132,222,000