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Common Shares | 9 Months Ended
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Sep. 30, 2012
Stockholders' Equity Note [Abstract] |
Stockholders' Equity Note Disclosure [Text Block] | 4. Common Shares In March 2010, we announced the creation of an at-the-market (“ATM”) share offering program through which we could, but had no obligation to, sell common shares having an aggregate offering price of up to $250 million (the “2010 ATM program”), in amounts and at times as we determined, into the existing trading market at current market prices as well as through negotiated transactions. The 2010 ATM program terminated in the second quarter of 2011, and no further common shares are available for sale under the 2010 ATM program. In May 2011, we created an ATM share offering program through which we could, but had no obligation to, sell common shares having an aggregate offering price of up to $300 million (the “2011 ATM program”), in amounts and at times as we determined, into the existing trading market at current market prices as well as through negotiated transactions. The net proceeds resulting from the 2011 ATM program were used to redeem all of our outstanding redeemable perpetual preferred units as further discussed in Note 5, "Operating Partnerships," and for other general corporate purposes, which included funding for development activities, financing of acquisitions, the redemption or other repurchase of outstanding debt or equity securities, reducing future borrowings under our $500 million unsecured line of credit, and the repayment of other indebtedness. The 2011 ATM program terminated in the second quarter of 2012, and no further common shares are available for sale under the 2011 ATM program. The following table presents activity under our 2010 and 2011 ATM programs for the periods presented (in thousands, except per share amounts):
| Three Months Ended |  | Nine Months Ended
| September 30, 2012 |  | September 30, 2011 |  | September 30, 2012 |  | September 30, 2011
Total net consideration | $ | — |  |  | $ | 32,736.8 |  |  | $ | 128,128.0 |  |  | $ | 69,862.9 |
Common shares sold | — |  |  | 506.2 |  |  | 1,971.4 |  |  | 1,127.9 |
Average price per share | $ | — |  |  | $ | 65.76 |  |  | $ | 66.01 |  |  | $ | 63.13 |
In May 2012, we created an ATM share offering program through which we can, but have no obligation to, sell common shares having an aggregate offering price of up to $300 million (the "2012 ATM program"), in amounts and at times as we determine, into the existing trading market at current market prices as well as through negotiated transactions. Actual sales from time to time may depend on a variety of factors including, among others, market conditions, the trading price of our common shares, and determinations by management of the appropriate sources of funding for us. We intend to use the net proceeds from the 2012 ATM program for general corporate purposes, which may include funding for development activities, financing of acquisitions, the redemption or other repurchase of outstanding debt or equity securities, reducing future borrowings under our $500 million unsecured line of credit, and the repayment of other indebtedness. The following table presents activity under our 2012 ATM program for the periods presented (in thousands, except per share amounts):
| Three Months Ended |  | Nine Months Ended
| September 30, 2012 |  | September 30, 2012
Total net consideration | $ | 88,915.9 |  |  | $ | 173,627.6 |
Common shares sold | 1,302.5 |  |  | 2,607.9 |
Average price per share | $ | 69.34 |  |  | $ | 67.63 |
As of September 30, 2012, we had common shares having an aggregate offering price of up to $123.6 million remaining available for sale under the 2012 ATM program. No additional shares were sold through the date of this filing. We currently have an automatic shelf registration statement which allows us to offer, from time to time, an unlimited amount of common shares, preferred shares, debt securities, or warrants. In January 2012, we issued 6,612,500 common shares in a public equity offering and received approximately $391.6 million in net proceeds. We utilized these proceeds to fund the acquisition of the remaining 80% interest we did not own in twelve real estate joint ventures that owned twelve apartment communities, containing 4,034 apartment homes in Dallas, Houston, Las Vegas, Phoenix, and Southern California, becoming sole owner of that portfolio. See Note 6, “Property Acquisitions, Discontinued Operations, and Assets Held for Sale” for further discussion of this transaction. On May 11, 2012, the shareholders of the Company approved an amendment to our Amended and Restated Declaration of Trust to increase our total number of authorized shares from 110.0 million to 185.0 million shares of beneficial interest, consisting of 175.0 million common shares and 10.0 million preferred shares.

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- Definition The entire disclosure for shareholders' equity, comprised of portions attributable to the parent entity and noncontrolling interest, if any, including other comprehensive income (as applicable). Including, but not limited to: (1) balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings; (2) accumulated balance for each classification of other comprehensive income and total amount of comprehensive income; (3) amount and nature of changes in separate accounts, including the number of shares authorized and outstanding, number of shares issued upon exercise and conversion, and for other comprehensive income, the adjustments for reclassifications to net income; (4) rights and privileges of each class of stock authorized; (5) basis of treasury stock, if other than cost, and amounts paid and accounting treatment for treasury stock purchased significantly in excess of market; (6) dividends paid or payable per share and in the aggregate for each class of stock for each period presented; (7) dividend restrictions and accumulated preferred dividends in arrears (in aggregate and per share amount); (8) retained earnings appropriations or restrictions, such as dividend restrictions; (9) impact of change in accounting principle, initial adoption of new accounting principle and correction of an error in previously issued financial statements; (10) shares held in trust for Employee Stock Ownership Plan (ESOP); (11) deferred compensation related to issuance of capital stock; (12) note received for issuance of stock; (13) unamortized discount on shares; (14) description, terms, and number of warrants or rights outstanding; (15) shares under subscription and subscription receivables, effective date of new retained earnings after quasi-reorganization and deficit eliminated by quasi-reorganization and, for a period of at least ten years after the effective date, the point in time from which the new retained dates; and (16) retroactive effective of subsequent change in capital structure. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section E Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Preferred Stock -URI http://asc.fasb.org/extlink&oid=6521494 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB TOPIC 4.C) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187143-122770 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Section B -Paragraph 7, 11A -Chapter 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. 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