CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Sep. 30, 2012	Dec. 31, 2011
CONSOLIDATED BALANCE SHEETS
Preferred Stock, Par value per share	$ 1.00	$ 1.00
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 per share	$ 0.01	$ 0.01
Common Stock, shares authorized	140,000,000	140,000,000
Common Stock, shares issued and outstanding	78,807,030	78,127,480
Treasury stock, shares	24,098,057	17,284,287