Common Stock of the Company (Common Stock [Member])

3 Months Ended

Mar. 31, 2012

Common Stock [Member]

Class of Stock [Line Items]

Common Stock of the Company

Common Stock of the Company

Issuance of Common Stock

In February 2012, the Company completed an underwritten public offering of 9,487,500 shares of its common stock. The net offering proceeds, after deducting underwriting discounts and commissions and offering expenses, were approximately $382.1 million. We used a portion of the net proceeds from the offering to fund acquisitions and for general corporate purposes.

At-The-Market Stock Offering Program

In July 2011, we commenced an at-the-market stock offering program under which we may offer and sell shares of our common stock having an aggregate gross sales price of up to $200.0 million from time to time in "at the market" offerings. As of March 31, 2012, the Company had sold 355,305 shares of common stock and approximately $187.0 million is available to be sold under this program. There were no sales of common stock under this program during the three months ended March 31, 2012. Actual sales will depend upon a variety of factors including but not limited to market conditions, the trading price of the Company's common stock and our capital needs. We have no obligation to sell shares under this program.