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Redeemable Convertible Preferred Stock	6 Months Ended
Redeemable Convertible Preferred Stock	Jun. 30, 2012
Redeemable Convertible Preferred Stock [Abstract]
Preferred Stock	Redeemable Convertible Preferred Stock In January 2012, the Company exercised its right to convert all of the outstanding 6.25% Redeemable Convertible Preferred Stock. In February 2012, the Company issued 8.3 million shares of common stock associated with the previously outstanding 6.25% Redeemable Convertible Preferred Stock.