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Equity (Tables) | 12 Months Ended
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Dec. 31, 2017
Class of Stock [Line Items] |
Schedule of Stock by Class, Preferred Stock | The following table sets forth the Company's Preferred Stock:
|  | Issue Date |  | Number of Shares Outstanding |  | Carrying Value |  | Liquidation Preference Per Share |  | Optional Redemption Date |  | Annual Dividends Payable Per Share
|  |  |  | (in thousands) |  |  |  |  |  |  |  |
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |
8.625% Series A Cumulative Redeemable |  | 2/12/1997 |  | 29 |  |  | $ | 28,892 |  |  | $ | 1,000 |  |  | 2/12/2027 |  | $ | 86.25 |
December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |
8.625% Series A Cumulative Redeemable |  | 2/12/1997 |  | 29 |  |  | $ | 28,920 |  |  | $ | 1,000 |  |  | 2/12/2027 |  | $ | 86.25 |
The following table sets forth the number of shares of Common Stock reserved for future issuance under the Company's long-term equity incentive plans:
| December 31,
| 2017 |  | 2016
Outstanding stock options and warrants | 655,822 |  |  | 602,115 |
Possible future issuance under equity incentive plans | 2,404,131 |  |  | 2,718,296 |
| 3,059,953 |  |  | 3,320,411 |
Common Stock [Member] |
Class of Stock [Line Items] |
Schedule of Dividends Payable | The following table sets forth the Company's estimated taxability to the common stockholders of dividends per share for federal income tax purposes:
| Year Ended December 31,
| 2017 (1) |  | 2016 (1) |  | 2015
Ordinary income | $ | 1.50 |  |  | $ | 1.15 |  |  | $ | 1.50 |
Capital gains | 0.32 |  |  | 1.29 |  |  | 0.13 |
Return of capital | — |  |  | — |  |  | 0.07 |
Total | $ | 1.82 |  |  | $ | 2.44 |  |  | $ | 1.70 |
__________
(1) | During 2016, cash dividends declared on Common Stock totaled $2.50 per share, of which approximately $0.06 was recognized as a 2017 distribution for federal income tax purposes.
Preferred Stock [Member] |
Class of Stock [Line Items] |
Schedule of Dividends Payable | The following table sets forth the Company's estimated taxability to the preferred stockholders of dividends per share for federal income tax purposes:
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
8.625% Series A Cumulative Redeemable: |  |  |  |  |
Ordinary income | $ | 71.00 |  |  | $ | 40.65 |  |  | $ | 79.23 |
Capital gains | 15.25 |  |  | 45.60 |  |  | 7.02 |
Total | $ | 86.25 |  |  | $ | 86.25 |  |  | $ | 86.25 |
Highwoods Realty Limited Partnership [Member] |
Class of Stock [Line Items] |
Schedule of Stock by Class, Preferred Stock | The following table sets forth the Operating Partnership's Preferred Units:
|  | Issue Date |  | Number of Units Outstanding |  | Carrying Value |  | Liquidation Preference Per Unit |  | Optional Redemption Date |  | Annual Distributions Payable Per Unit
|  |  |  | (in thousands) |  |  |  |  |  |  |  |
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |
8.625% Series A Cumulative Redeemable |  | 2/12/1997 |  | 29 |  |  | $ | 28,892 |  |  | $ | 1,000 |  |  | 2/12/2027 |  | $ | 86.25 |
December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |
8.625% Series A Cumulative Redeemable |  | 2/12/1997 |  | 29 |  |  | $ | 28,920 |  |  | $ | 1,000 |  |  | 2/12/2027 |  | $ | 86.25 |

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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://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=84159872&loc=d3e21506-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 3: 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)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: 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 5: 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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21553-112644 Reference 7: 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=84159872&loc=d3e21475-112644 Reference 8: 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(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 9: http://www.xbrl.org/2003/role/presentationRef -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 10: 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(27)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21521-112644 Reference 12: 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=84159872&loc=d3e21484-112644 Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21538-112644 Reference 14: 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=84159872&loc=d3e21488-112644 + Details
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