Thanks Walrus - It is a "from time to time" offering. This signals that they won't likely be doing a regular SPO anytime soon. This from the 497:
"The equity distribution agreement provides that we may offer and sell up to 45,000,000 shares of our common stock from time to time through the Sales Manager, as our agent for the offer and sale of such common stock. Sales of our common stock, if any, under this prospectus supplement and the accompanying prospectus may be made in negotiated transactions or transactions that are deemed to be "at the market" as defined in Rule 415 under the Securities Act of 1933, as amended, or the "1933 Act," including sales made directly on the NASDAQ Global Select Market or sales made to or through a market maker other than on an exchange."
This was also in the 497:
"Common Stock Issuances
During the period from January 7, 2013 to February 5, 2013, we sold 10,248,051 shares of our common stock at an average price of $11.25 per share, and raised $115.3 million of gross proceeds, under our at-the-market offering program (the "ATM Program"). Net proceeds were $114.0 million net of commissions to the broker-dealer on shares sold and offering costs. "