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Common Stock and Other Equity Related Transactions Common Stock and Other Equity Related Transactions | 12 Months Ended
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Dec. 31, 2015
Equity [Abstract] |
Common Stock and Other Equity Related Transactions | Common Stock and Other Equity Related Transactions In July 1997, we adopted the 1997 Non-Qualified Employee Stock Purchase Plan ("ESPP"). Pursuant to the ESPP, as amended on May 3, 2006, certain of our employees and directors may each annually acquire up to $250,000 of our common stock. The aggregate number of shares of common stock available under the ESPP shall not exceed 2,000,000, subject to adjustment by our Board of Directors. The common stock may be purchased monthly at a price equal to 85% of the lesser of: (a) the closing price for a share of common stock on the last day of the offering period; and (b) the closing price for a share of common stock on the first day of the offering period. Shares of common stock issued through the ESPP for the years ended December 31, 2015, 2014 and 2013 were 19,788, 30,739 and 18,411, respectively. The following table presents the changes in our outstanding common stock for the years ended December 31, 2015, 2014 and 2013 (excluding OP Units of 7,207,678, 7,231,967, and 7,667,723 outstanding at December 31, 2015, 2014 and 2013, respectively):
| 2015 |  | 2014 |  | 2013
Shares outstanding at January 1, | 83,879,779 |  |  | 83,313,677 |  |  | 83,193,310 |
Common stock issued through conversion of OP Units | 24,289 |  |  | 435,756 |  |  | 29,566 |
Common stock issued through exercise of options | 220,000 |  |  | — |  |  | 20,000 |
Common stock issued through stock grants | 158,013 |  |  | 186,666 |  |  | 173,332 |
Common stock issued through ESPP and Dividend Reinvestment Plan | 20,134 |  |  | 31,203 |  |  | 19,013 |
Common stock repurchased and retired | (49,150 | ) |  | (87,523 | ) |  | (121,544 | )
Shares outstanding at December 31, | 84,253,065 |  |  | 83,879,779 |  |  | 83,313,677 |
During the years ended December 31, 2015, 2014 and 2013, we repurchased shares of common stock representing common stock surrendered to satisfy income tax withholding obligations due as a result of the vesting of restricted stock grants at a weighted average price of $66.20, $51.62 and $36.48 per share, respectively. As of both December 31, 2015 and 2014, ELS' percentage ownership of the Operating Partnership was approximately 92.1%. The remaining approximately 7.9% was owned by the Common OP Unitholders. The following regular quarterly distributions have been declared and paid to common stockholders and common OP Unit non-controlling interests since January 1, 2013:
Distribution Amount Per Share |  | For the Quarter Ending |  | Stockholder Record Date |  | Payment Date
$0.2500 |  | March 31, 2013 |  | March 28, 2013 |  | April 12, 2013
$0.2500 |  | June 30, 2013 |  | June 28, 2013 |  | July 12, 2013
$0.2500 |  | September 30, 2013 |  | September 27, 2013 |  | October 11, 2013
$0.2500 |  | December 31, 2013 |  | December 27, 2013 |  | January 10, 2014
$0.3250 |  | March 31, 2014 |  | March 28, 2014 |  | April 11, 2014
$0.3250 |  | June 30, 2014 |  | June 27, 2014 |  | July 11, 2014
$0.3250 |  | September 30, 2014 |  | September 26, 2014 |  | October 10, 2014
$0.3250 |  | December 31, 2014 |  | December 26, 2014 |  | January 9, 2015
$0.3750 |  | March 31, 2015 |  | March 27, 2015 |  | April 10, 2015
$0.3750 |  | June 30, 2015 |  | June 26, 2015 |  | July 10, 2015
$0.3750 |  | September 30, 2015 |  | September 25, 2015 |  | October 9, 2015
$0.3750 |  | December 31, 2015 |  | December 28, 2015 |  | January 8, 2016

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(d),(e)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 4: 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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 6: 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=27012166&loc=d3e187143-122770 Reference 7: 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 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 9: 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 10: 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 11: 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 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 13: 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 14: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph d -Article 4 Reference 15: 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 16: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section E Reference 17: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Article 4 Reference 18: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section C Reference 19: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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