Stockholders' Equity

12 Months Ended

Dec. 31, 2011

Stockholders' Equity [Abstract]

Stockholders' Equity

12.    Stockholders' Equity

As of December 31, 2011, the Company had 148,107,611 shares of Common Stock outstanding.

On January 28, 2011, the Company paid a dividend in the amount of $0.50 per share of Common Stock to shareholders of record as of the close of business on December 31, 2010. On April 29, 2011, the Company paid a dividend in the amount of $0.50 per share of Common Stock to shareholders of record as of the close of business on March 31, 2011. On July 29, 2011, the Company paid a dividend in the amount of $0.50 per share of Common Stock to shareholders of record as of the close of business on June 30, 2011. On October 31, 2011, the Company paid a dividend in the amount of $0.50 per share of Common Stock to shareholders of record as of the close of business on September 30, 2011. On December 14, 2011, the Company's Board of Directors declared a dividend in the amount of $0.55 per share of Common Stock payable on January 27, 2012 to shareholders of record as of the close of business on December 31, 2011.

On April 21, 2010, the Company announced that it had established an "at the market" (ATM) stock offering program through which it may sell from time to time up to an aggregate of $400.0 million of its common stock through sales agents for a three-year period. During the year ended December 31, 2011, the Company utilized the initial ATM stock offering program to issue an aggregate of 4,228,993 shares of Common Stock for gross proceeds of approximately $400.0 million and net proceeds of approximately $394.7 million. No amount remains available for issuance under this ATM program.

On June 2, 2011, the Company established a new ATM stock offering program through which it may sell from time to time up to an aggregate of $600.0 million of its common stock through sales agents over a three-year period. During the year ended December 31, 2011, the Company issued an aggregate of 431,223 shares of Common Stock under the ATM stock offering program for gross proceeds of approximately $44.9 million and net proceeds of approximately $44.3 million. As of December 31, 2011, approximately $555.1 million remained available for issuance under this ATM program.

During the years ended December 31, 2011 and 2010, the Company issued 2,919,323 and 591,900 shares of its Common Stock, respectively, in connection with the redemption of an equal number of OP Units.

During the years ended December 31, 2011 and 2010, the Company issued 316,159 and 638,957 shares of its Common Stock, respectively, upon the exercise of options to purchase Common Stock by certain employees.