Treasury Stock	12 Months Ended
Dec. 31, 2011
Equity [Abstract]
Treasury Stock	Treasury Stock Stock Repurchase Program In August 2011, our Board of Directors authorized the repurchase of up to $150.0 million of our common stock, exclusive of any fees, commissions or other expenses. In February 2012, our Board of Directors authorized the repurchase of an additional $150.0 million of our common stock, exclusive of any fees, commissions or other expenses. The purchase of stock under these programs may be made in the open market or through privately negotiated transactions. 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. All shares repurchased are recorded as treasury stock at cost. During the year ended December 31, 2011, we purchased 28.6 million shares of common stock for an aggregate purchase price of $128.9 million, net of $0.6 million of commissions, for an average price of $4.51. At December 31, 2011, approximately $21.1 million was available to repurchase common stock pursuant to the stock repurchase program. At December 31, 2011, $1.1 million of the $128.9 million amount repurchased remained unpaid and is recorded in accrued expenses. Shares for Tax Withholding During the year ended December 31, 2011, we withheld 111,000 shares from restricted shares that vested during the respective period to satisfy tax withholding obligations. Minimum tax withholding obligations that arose on the vesting of restricted shares were $0.8 million for the year ended December 31, 2011. These shares are reflected as treasury stock at cost.

Treasury Stock

Stock Repurchase Program

In August 2011, our Board of Directors authorized the repurchase of up to $150.0 million of our common stock, exclusive of any fees, commissions or other expenses. In February 2012, our Board of Directors authorized the repurchase of an additional $150.0 million of our common stock, exclusive of any fees, commissions or other expenses. The purchase of stock under these programs may be made in the open market or through privately negotiated transactions. 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. All shares repurchased are recorded as treasury stock at cost.

During the year ended December 31, 2011, we purchased 28.6 million shares of common stock for an aggregate purchase price of $128.9 million, net of $0.6 million of commissions, for an average price of $4.51. At December 31, 2011, approximately $21.1 million was available to repurchase common stock pursuant to the stock repurchase program. At December 31, 2011, $1.1 million of the $128.9 million amount repurchased remained unpaid and is recorded in accrued expenses.

Shares for Tax Withholding

During the year ended December 31, 2011, we withheld 111,000 shares from restricted shares that vested during the respective period to satisfy tax withholding obligations. Minimum tax withholding obligations that arose on the vesting of restricted shares were $0.8 million for the year ended December 31, 2011. These shares are reflected as treasury stock at cost.