Treasury Stock	9 Months Ended
Sep. 30, 2013
Equity [Abstract]
Treasury Stock	15. Treasury Stock Stock Repurchase Program Our Board of Directors previously authorized the repurchase of up to $300.0 million of our common stock, exclusive of any fees, commissions or other expenses. The purchase of stock under the program may be made in the open market or through privately negotiated transactions. Since inception of the program, we have purchased a total of 45.0 million shares at an aggregate purchase price of $208.4 million, net of $0.9 million of commissions. The timing, manner, price and amount of any repurchases will be determined by us at our discretion and will depend upon a variety of factors including economic and market conditions, the cash needs and investment opportunities for the business, price, applicable legal requirements and other factors. Our stock repurchase program has been and is expected to be funded with available cash and may be suspended or discontinued at any time. During the three and nine months ended September 30, 2013, we made no purchases under the stock repurchase program. During the three and nine months ended September 30, 2012, we purchased 8.4 million and 16.5 million shares of common stock for an aggregate purchase price of $41.8 million and $79.5 million, respectively, net of $0.2 million and $0.3 million of commissions, respectively, for an average price of $4.99 and $4.83, respectively. At September 30, 2013, there were no unsettled shares, and there was approximately $91.6 million available to repurchase common stock pursuant to the stock repurchase program.

15. Treasury Stock

Stock Repurchase Program

Our Board of Directors previously authorized the repurchase of up to $300.0 million of our common stock, exclusive of any fees, commissions or other expenses. The purchase of stock under the program may be made in the open market or through privately negotiated transactions. Since inception of the program, we have purchased a total of 45.0 million shares at an aggregate purchase price of $208.4 million, net of $0.9 million of commissions. The timing, manner, price and amount of any repurchases will be determined by us at our discretion and will depend upon a variety of factors including economic and market conditions, the cash needs and investment opportunities for the business, price, applicable legal requirements and other factors. Our stock repurchase program has been and is expected to be funded with available cash and may be suspended or discontinued at any time.

During the three and nine months ended September 30, 2013, we made no purchases under the stock repurchase program. During the three and nine months ended September 30, 2012, we purchased 8.4 million and 16.5 million shares of common stock for an aggregate purchase price of $41.8 million and $79.5 million, respectively, net of $0.2 million and $0.3 million of commissions, respectively, for an average price of $4.99 and $4.83, respectively. At September 30, 2013, there were no unsettled shares, and there was approximately $91.6 million available to repurchase common stock pursuant to the stock repurchase program.