2.2.0.25falsefalse0211 - Disclosure - Stockholders' Equitytruefalsefalse1falsefalseUSDfalsefalse1/1/2010 - 12/31/2010 USD ($) / shares USD ($) $Jan-01-2010_Dec-31-2010http://www.sec.gov/CIK0000780053duration2010-01-01T00:00:002010-12-31T00:00:00USDEPSDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0USDUSD$2true0us-gaap_StockholdersEquityNoteAbstractus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalseStockholders' Equity [Abstract]3false0us-gaap_StockholdersEquityNoteDisclosureTextBlockus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00  <div style="margin-left: 0%"> <div style="margin-top: 12pt; font-size: 1pt">  </div> <table width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt; font-family: Arial, Helvetica; color: #000000; background: transparent; text-align: left"> <tr> <td width="5%"></td> <td width="95%"></td> </tr> <tr valign="top"> <td> <b><font style="font-family: 'Times New Roman', Times">11.  </font></b> </td> <td> <b><font style="font-family: 'Times New Roman', Times">Stockholders’ Equity</font></b> </td> </tr> </table> <div style="margin-top: 6pt; font-size: 1pt">  </div> <div align="left" style="margin-left: 2%; margin-right: 0%; font-size: 10pt; font-family: Arial, Helvetica; color: #000000; background: transparent"> <b><i><font style="font-family: 'Times New Roman', Times">Preferred Stock</font></i></b> </div> <div style="margin-top: 6pt; font-size: 1pt">  </div> <div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 4%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"> During 2004, we issued 7.75% Series B Cumulative Convertible Preferred Stock (“Series B Preferred Stock”) with a liquidation preference of $100 per share. The Series B Preferred Stock was convertible upon the occurrence of certain events. </div> <div style="margin-top: 6pt; font-size: 1pt">  </div> <div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 4%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"> During 2009, the Series B Preferred Stock was convertible from October 1, 2009 to December 31, 2009, and during that time, approximately 235,000 shares were converted into approximately 1,061,000 shares of common stock at a weighted average conversion price of $22.20 per share (equivalent to 4.5054 shares of common stock per share of Series B Preferred Stock). </div> <div style="margin-top: 6pt; font-size: 1pt">  </div> <div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 4%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"> There were 513,644 shares of Series B Preferred Stock outstanding as of December 31, 2009. As of December 31, 2009, if all of the Series B Preferred Stock were to have converted, it would have resulted in the issuance of approximately 2,319,000 common shares. </div> <div style="margin-top: 6pt; font-size: 1pt">  </div> <div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 4%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"> On January 18, 2010, we redeemed all outstanding shares of our Series B Preferred Stock at a redemption price of $103.875 per share plus an amount equal to accumulated and unpaid dividends thereon to the redemption date ($0.3875), for a total redemption price of $104.2625 per share, payable only in cash. As a result of the redemption, each share of Series B Preferred Stock was convertible until January 14, 2010 into 4.5150 shares of common stock. During that time, 512,727 shares were converted into approximately 2,315,000 shares of common stock. On January 18, 2010, we redeemed 917 shares that remained outstanding. </div> <div style="margin-top: 12pt; font-size: 1pt">  </div> <div align="left" style="margin-left: 2%; margin-right: 0%; font-size: 10pt; font-family: Arial, Helvetica; color: #000000; background: transparent"> <b><i><font style="font-family: 'Times New Roman', Times">Common Stock</font></i></b> </div> <div style="margin-top: 6pt; font-size: 1pt">  </div> <div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 4%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"> We enter into sales agreements from time to time with agents to sell shares of our common stock through an <font style="white-space: nowrap">at-the-market</font> equity offering program. On January 15, 2010, we entered into two sales agreements to sell up to an aggregate of 5,000,000 shares of our common stock from time to time. When that program was completed, we entered into two additional sales agreements on July 2, 2010 to sell up to an aggregate of an additional 5,000,000 shares of our common stock from time to time. During 2010, we issued and sold approximately 9,141,000 shares of common stock at a weighted average price of $37.04 per share, resulting in net proceeds of approximately $335.1 million after sales agent fees. During 2009, we issued and sold approximately 9,537,000 shares of common stock at a weighted average price of $30.34 per share, resulting in net proceeds of approximately $286.3 million after sales agent fees. </div> <div style="margin-top: 6pt; font-size: 1pt">  </div> <div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 4%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"> We sponsor a dividend reinvestment and stock purchase plan that enables existing stockholders to purchase additional shares of common stock by automatically reinvesting all or part of the cash dividends paid on their shares of common stock. Prior to November 27, 2009, the plan also allowed investors to acquire shares of our common stock for cash, subject to certain limitations, including a maximum monthly investment of $10,000, at a discount ranging from 0% to 5%, determined by us from time to time in accordance with the plan. The discount during 2010 and 2009 was 2%. During 2010, we issued approximately 150,000 shares of common stock, at an average price of $33.26 per share, resulting in proceeds of approximately $5.0 million. During 2009, we issued approximately 1,083,000 shares of common stock, at an average price of $28.27 per share, resulting in proceeds of approximately $30.6 million. </div> <div style="margin-top: 6pt; font-size: 1pt">  </div> <div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 4%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"> On January 18, 2010, we redeemed all outstanding shares of Series B Preferred Stock, and as a result, 512,727 shares of Series B Preferred Stock were converted into approximately 2,315,000 shares of common stock during the period from January 1, 2010 to January 14, 2010. During 2009, approximately 235,000 shares of Series B Preferred Stock were converted into approximately 1,061,000 shares of common stock. </div> <div style="margin-top: 6pt; font-size: 1pt">  </div> <div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 4%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"> During 2010, 30,166 OP Units issued by NHP/PMB were exchanged for 30,166 shares of common stock, and during 2009, 202,361 OP Units issued by NHP/PMB were exchanged for 202,361 shares of common stock (see Note 5). </div> </div>  <!-- Begin Block Tagged NotefalsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringDisclosures related to accounts comprising shareholders' equity, including other comprehensive income. 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