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Common Stock and Other Equity Related Transactions (Tables) | 12 Months Ended
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Dec. 31, 2018
Equity [Abstract] |
Schedule of Stock by Class | The following table presents the shares that were issued under our prior ATM equity offering program:
| Years Ended December 31,
(amounts in thousands, except share data) | 2018 |  | 2017 |  | 2016
Shares of Common Stock sold | 861,141 |  |  | 1,380,017 |  |  | 683,548 |
Weighted average price | $ | 91.45 |  |  | $ | 87.46 |  |  | $ | 73.15 |
Total gross proceeds | $ | 78,755 |  |  | $ | 120,698 |  |  | $ | 50,000 |
Commissions paid to sales agents | $ | 1,028 |  |  | $ | 1,512 |  |  | $ | 657 |
The following quarterly distributions have been declared and paid to our preferred stockholders since January 1, 2016 and prior to the stock's redemption, which occurred in September 2017:
Distribution Amount Per Share |  | For the Quarter Ending |  | Stockholder Record Date |  | Payment Date
$0.421875 |  | March 31, 2016 |  | March 21, 2016 |  | March 31, 2016
$0.421875 |  | June 30, 2016 |  | June 17, 2016 |  | June 30, 2016
$0.421875 |  | September 30, 2016 |  | September 16, 2016 |  | September 30, 2016
$0.421875 |  | December 31, 2016 |  | December 15, 2016 |  | December 31, 2016
$0.421875 |  | March 31, 2017 |  | March 10, 2017 |  | March 31, 2017
$0.421875 |  | June 30, 2017 |  | June 15, 2017 |  | June 30, 2017
$0.421875 |  | September 30, 2017 |  | September 15, 2017 |  | October 2, 2017
Schedule of Common Stock Outstanding Roll Forward | The following table presents the changes in our outstanding common stock (excluding OP Units of 5,745,966, 5,834,100, and 7,170,000 outstanding at December 31, 2018, 2017 and 2016, respectively):
| Years Ended December 31,
| 2018 |  | 2017 |  | 2016
Shares outstanding at January 1, | 88,585,160 |  |  | 85,529,386 |  |  | 84,253,065 |
Common stock issued through the ATM Equity Offering Program | 861,141 |  |  | 1,380,017 |  |  | 683,548 |
Common stock issued through conversion of OP Units | 88,134 |  |  | 1,335,900 |  |  | 37,678 |
Common stock issued through exercise of options | 202,800 |  |  | 220,000 |  |  | 440,000 |
Common stock issued through restricted stock grants | 192,505 |  |  | 130,426 |  |  | 133,717 |
Common stock forfeitures | — |  |  | (990 | ) |  | — |
Common stock issued through ESPP and Dividend Reinvestment Plan | 22,572 |  |  | 25,101 |  |  | 17,373 |
Common stock repurchased and retired | (31,294 | ) |  | (34,680 | ) |  | (35,995 | )
Shares outstanding at December 31, | 89,921,018 |  |  | 88,585,160 |  |  | 85,529,386 |
Dividends Declared | The following regular quarterly distributions have been declared and paid to common stockholders and common OP Unit non-controlling interests since January 1, 2016:
Distribution Amount Per Share |  | For the Quarter Ended |  | Stockholder Record Date |  | Payment Date
$0.4250 |  | March 31, 2016 |  | March 25, 2016 |  | April 8, 2016
$0.4250 |  | June 30, 2016 |  | June 24, 2016 |  | July 8, 2016
$0.4250 |  | September 30, 2016 |  | September 30, 2016 |  | October 14, 2016
$0.4250 |  | December 31, 2016 |  | December 30, 2016 |  | January 13, 2017
$0.4875 |  | March 31, 2017 |  | March 31, 2017 |  | April 14, 2017
$0.4875 |  | June 30, 2017 |  | June 30, 2017 |  | July 14, 2017
$0.4875 |  | September 30, 2017 |  | September 29, 2017 |  | October 13, 2017
$0.4875 |  | December 31, 2017 |  | December 29, 2017 |  | January 12, 2018
$0.5500 |  | March 31, 2018 |  | March 30, 2018 |  | April 13, 2018
$0.5500 |  | June 30, 2018 |  | June 29, 2018 |  | July 13, 2018
$0.5500 |  | September 30, 2018 |  | September 28, 2018 |  | October 12, 2018
$0.5500 |  | December 31, 2018 |  | December 28, 2018 |  | January 11, 2019

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- Definition Tabular disclosure of an entity's stock, including par or stated value per share, number and dollar amount of share subscriptions, shares authorized, shares issued, shares outstanding, number and dollar amount of shares held in an employee trust, dividend per share, total dividends, share conversion features, par value plus additional paid in capital, the value of treasury stock and other information necessary to a fair presentation, and EPS information. Stock by class includes common, convertible, and preferred stocks which are not redeemable or redeemable solely at the option of the issuer. Includes preferred stock with redemption features that are solely within the control of the issuer and mandatorily redeemable stock if redemption is required to occur only upon liquidation or termination of the reporting entity. If more than one issue is outstanding, state the title of each issue and the corresponding dollar amount; dollar amount of any shares subscribed but unissued and the deduction of subscriptions receivable there from; number of shares authorized, issued, and outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65888546&loc=d3e21300-112643 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21553-112644 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65877616&loc=d3e177068-122764 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21538-112644 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -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 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(d)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21488-112644 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -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 11: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644 Reference 12: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(27)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 13: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21484-112644 Reference 14: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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