CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Statement of Financial Position [Abstract]
Preferred shares, par value	$ 0.01	$ 0.01
Preferred shares, shares authorized	5,000,000	5,000,000
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	200,000,000	200,000,000
Treasury stock, shares	15,319,967	14,811,885
Common stock, shares, outstanding	57,106,172	57,614,254
Common stock, shares issued	72,426,139	72,426,139