Look to the 2013 Q1 10-Q. It states the following changes to the rights of preferred shareholders as of March 31, 2013:
"Among other rights, the holders of Series A Preferred are entitled, as of March 31, 2013, to an aggregate preferential payment of approximately $86 million in the event we effect a liquidation and approximately $136 million in the event we effect certain transactions that result in a change of control or sale of substantially all of our assets, meaning that the holders of Series A Preferred would be entitled to receive such amounts before any distributions could be made to holders of our common stock following such an event or transaction."
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