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Stockholders' Equity | 12 Months Ended
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Dec. 31, 2012
Stockholders' Equity |
Stockholders' Equity | 4. Stockholders' Equity As of December 31, 2012 and 2011, the Company's charter had authorized for issuance a total of 140,000,000 shares of common stock and 50,000,000 shares of preferred stock. During the year ended December 31, 2012, the Company: (i) issued 18,840,206 shares of common stock through underwritten public offerings and public offerings under CEP II and CEP III; (ii) issued 407,784 shares of common stock in connection with stock options exercised; (iii) issued 2,331 common shares through the Company's dividend reinvestment plan; (iv) issued 96,592 common shares in connection with stock grants; (v) withheld 121,351 common shares to satisfy employees' tax withholding and other liabilities; (vi) cancelled 4,027 shares of restricted common stock upon forfeiture; and (vii) issued 6,260 shares through the Employee Stock Purchase Plan. In addition, the Company granted 115,303 options for common stock to employees. Any deferred compensation related to the Company's stock option and restricted stock grants during 2012 is not reflected on the Company's Consolidated Balance Sheet as of December 31, 2012, and will not be reflected until earned as compensation cost. In December 2012, the Company issued 16,675,000 shares of common stock at $130.00 per share. Net proceeds of approximately $2,102,718,000 are to prefund the expected Archstone Acquisition and related matters, discussed further in Note 7. "Commitments and Contingencies". In November 2010, the Company commenced a second continuous equity program ("CEP II"), under which the Company was authorized to sell up to $500,000,000 of its common stock from time to time during a 36-month period. During the year ended December 31, 2012, the Company completed the sale of common stock authorized under CEP II, selling 1,435,215 shares at an average sales price of $140.41 per share, for aggregate net proceeds of $198,489,000. From program inception in November 2010 through completion in 2012, the Company issued 3,925,980 common shares at an average price of $127.36 per share for net proceeds of $492,490,000. In August 2012, the Company commenced a third continuous equity program ("CEP III"), under which the Company is authorized to sell up to $750,000,000 of shares of its common stock from time to time during a 36-month period. Actual sales will depend on a variety of factors to be determined by the Company, including market conditions, the trading price of the Company's common stock and determinations by the Company of the appropriate sources of funding for the Company. In conjunction with CEP III, the Company engaged sales agents who receive compensation of approximately 1.5% of the gross sales price for shares sold. During the year ended December 31, 2012, the Company sold 729,991 shares at an average sales price of $142.09 per share, for net proceeds of $102,168,000.

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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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