CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	250,000.00	250,000.00
Preferred stock, shares issued	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	200,000,000.0	200,000,000.0
Common stock, shares issued	162,800,000	162,800,000
Treasury stock, shares	20,600,000	20,500,000