CONSOLIDATED CONDENSED BALANCE SHEETS (Parenthetical) (USD $)	Sep. 30, 2012	Dec. 31, 2011
Preferred stock,par value	$ 0.01	$ 0.01
Preferred stock,shares authorized	10,000,000	10,000,000
Preferred stock,shares issued	0	0
Preferred stock,shares outstanding	0	0
Common stock,par value	$ 0.01	$ 0.01
Common stock,shares authorized	250,000,000	250,000,000
Common stock,shares issued	137,067,601	137,028,464
Treasury stock,shares	30,183,995	31,551,170