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Balance Sheet Parenthetical (USD $) In Thousands, except Share data, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Tenant receivables allowance for doubtful accounts | $ 2,054 | $ 1,977
Other receivables allowance for doubtful accounts | $ 1,283 | $ 1,270
Preferred stock, par value (in dollars per share) | $ 0.01 | $ 0.01
Preferred stock, shares authorized | 15,000,000 | 15,000,000
Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01
Common stock, shares authorized | 350,000,000 | 350,000,000
Common stock, shares, issued | 163,387,752 | 161,309,652
Common stock, shares outstanding | 163,387,752 | 161,309,652
Preferred stock, shares outstanding Series D |  |
Preferred stock, shares outstanding | 1,815,000 | 1,815,000
Series E Preferred Stock [Member] |  |
Preferred stock, shares outstanding | 690,000 | 690,000

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- Definition Face amount or stated value of common stock per share; generally not indicative of the fair market value per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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