Stock Repurchases

9 Months Ended

Sep. 30, 2011

Stock Repurchases [Abstract]

Stock Repurchases

5. Stock Repurchases

As of September 30, 2011, 6,366,725 shares remained available for repurchase under the share repurchase program (the "Repurchase Program") authorized by our Board of Directors. The terms of the Repurchase Program provide that we may repurchase shares of our common stock, from time to time depending on market conditions and other considerations, in the open market or through privately negotiated transactions in accordance with Rule 10b-18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"). Unless earlier terminated by our Board of Directors, the Repurchase Program will expire when we repurchase all shares authorized for repurchase thereunder.

The following table sets forth information regarding the shares of our common stock that we repurchased in the periods indicated:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2011		2010		2011		2010
Number of shares		370,000		1,775,000		3,470,000		3,727,500
Total cost		$29,579		$114,891		$248,099		$314,950
Average cost per share		$79.94		$64.73		$71.50		$84.49