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Consolidated Statements of Equity - USD ($) $ in Thousands | Total | Common Stock Issued to Public Under At-the-Market Program | Forward Equity Sale Agreement | Preferred Shares | Common Shares | Common Shares Common Stock Issued to Public Under At-the-Market Program | Common Shares Forward Equity Sale Agreement | Additional Paid-in Capital | Additional Paid-in Capital Common Stock Issued to Public Under At-the-Market Program | Additional Paid-in Capital Forward Equity Sale Agreement | Cumulative Distributions in Excess of Net Income | Accumulated Other Comprehensive Income (Loss) | Noncontrolling Interests | Corporate Office Properties, L.P. | Corporate Office Properties, L.P. Common Stock Issued to Public Under At-the-Market Program | Corporate Office Properties, L.P. Forward Equity Sale Agreement | Corporate Office Properties, L.P. Common Shares | Corporate Office Properties, L.P. Common Shares Common Stock Issued to Public Under At-the-Market Program | Corporate Office Properties, L.P. Common Shares Forward Equity Sale Agreement | Corporate Office Properties, L.P. Accumulated Other Comprehensive Income (Loss) | Corporate Office Properties, L.P. Noncontrolling Interests | Corporate Office Properties, L.P. Limited Partner | Corporate Office Properties, L.P. Limited Partner Preferred Shares | Corporate Office Properties, L.P. General Partner | Corporate Office Properties, L.P. General Partner Preferred Shares
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Balance (COPT: 98,498,651 and 101,292,299 shares as of December 31, 2016 and 2017, respectively) at Dec. 31, 2016 | $ 1,612,777 |  |  | $ 172,500 | $ 985 |  |  | $ 2,116,581 |  |  | $ (747,825) | $ (1,731) | $ 72,267 | $ 1,612,777 |  |  | $ 1,419,710 |  |  | $ (1,854) | $ 13,621 |  | $ 8,800 |  | $ 172,500
Balance (preferred units) at Dec. 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 352,000 |  | 6,900,000
Balance (in units/shares) at Dec. 31, 2016 | 98,498,651 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 102,089,042 |  |  |  |  |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption of preferred units resulting from redemption of preferred shares (in units) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (6,900,000)
Redemption of preferred shares (6,900,000 shares) | $ (172,500) |  |  | (172,500) |  |  |  | 6,847 |  |  | (6,847) |  |  | (172,500) |  |  |  |  |  |  |  |  |  |  | $ (172,500)
Conversion of common units to common shares (COPT: 337,000 and 1,895,627 shares for the nine months ended September 30, 2017 and 2018, respectively) | $ 0 |  |  |  | 3 |  |  | 4,599 |  |  |  |  | (4,602) |  |  |  |  |  |  |  |  |  |  |  |
Common shares issued during the period |  | $ 19,668 |  |  |  | $ 6 |  |  | $ 19,662 |  |  |  |  |  | $ 19,668 |  |  | $ 19,668 |  |  |  |  |  |  |
Common shares issued during the period (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 591,042 |  |  |  |  |  |  |
Issuance of common units resulting from exercise of share options (in units) | 5,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000 |  |  |  |  |  |  |  |
Issuance of common units resulting from exercise of share options (COPT: 5,000 shares for the nine months ended September 30, 2017) | $ 150 |  |  |  | 0 |  |  | 150 |  |  |  |  |  | 150 |  |  | $ 150 |  |  |  |  |  |  |  |
Share-based compensation issuance, net of redemptions (in units/shares) | 176,477 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 176,477 |  |  |  |  |  |  |  |
Share-based compensation issuance, net of redemptions (COPT: 176,477 and 141,633 shares issued, net of redemptions for the nine months ended September 30, 2017 and 2018, respectively) | $ 4,444 |  |  |  | 2 |  |  | 4,442 |  |  |  |  |  | 4,444 |  |  | $ 4,444 |  |  |  |  |  |  |  |
Redemption of vested equity awards | (1,869) |  |  |  |  |  |  | (1,869) |  |  |  |  |  | (1,869) |  |  | (1,869) |  |  |  |  |  |  |  |
Adjustments to noncontrolling interests resulting from changes in ownership of COPLP | 0 |  |  |  |  |  |  | (589) |  |  |  |  | 589 |  |  |  |  |  |  |  |  |  |  |  |
Comprehensive income | 63,115 |  |  |  |  |  |  |  |  |  | 59,124 | 872 | 3,119 | 63,115 |  |  | 54,481 |  |  | 902 | 1,018 |  | $ 495 |  | 6,219
Dividends / Distributions to owners of common and preferred units | (88,300) |  |  |  |  |  |  |  |  |  | (88,300) |  |  | (91,562) |  |  | (84,848) |  |  |  |  |  | $ (495) |  | $ (6,219)
Distributions to owners of common and preferred units in COPLP | (3,262) |  |  |  |  |  |  |  |  |  |  |  | (3,262) |  |  |  |  |  |  |  |  |  |  |  |
Distributions to noncontrolling interests in subsidiaries | (2,614) |  |  |  |  |  |  |  |  |  |  |  | (2,614) | (2,614) |  |  |  |  |  |  | (2,614) |  |  |  |
Adjustment to arrive at fair value of redeemable noncontrolling interests | $ 244 |  |  |  |  |  |  | 244 |  |  |  |  |  | 244 |  |  | $ 244 |  |  |  |  |  |  |  |
Balance (in units/shares) at Sep. 30, 2017 | 99,608,170 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 102,861,561 |  |  |  |  |  |  |  |
Balance (preferred units) at Sep. 30, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 352,000 |  | 0
Balance (COPT: 99,608,170 shares and 108,848,223 shares as of September 30, 2017 and 2018, respectively) at Sep. 30, 2017 | $ 1,431,853 |  |  | 0 | 996 |  |  | 2,150,067 |  |  | (783,848) | (859) | 65,497 | 1,431,853 |  |  | $ 1,411,980 |  |  | (952) | 12,025 |  | $ 8,800 |  | $ 0
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of accounting change for adoption of hedge accounting guidance |  |  |  |  |  |  |  |  |  |  | (276) | 276 |  |  |  |  | (276) |  |  | 276 |  |  |  |  |
Balance, as adjusted | 1,468,307 |  |  | 0 | 1,013 |  |  | 2,201,047 |  |  | (802,361) | 2,443 | 66,165 | 1,468,307 |  |  | 1,444,746 |  |  | 2,449 | 12,312 |  | 8,800 |  | 0
Balance (COPT: 98,498,651 and 101,292,299 shares as of December 31, 2016 and 2017, respectively) at Dec. 31, 2017 | $ 1,468,307 |  |  | 0 | 1,013 |  |  | 2,201,047 |  |  | (802,085) | 2,167 | 66,165 | 1,468,307 |  |  | $ 1,445,022 |  |  | 2,173 | 12,312 |  | $ 8,800 |  | $ 0
Balance (preferred units) at Dec. 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 352,000 | 352,000 |  | 0
Balance (in units/shares) at Dec. 31, 2017 | 101,292,299 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 104,543,177 |  |  |  |  | 3,250,878 |  | 101,292,299 |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of common units to common shares (COPT: 337,000 and 1,895,627 shares for the nine months ended September 30, 2017 and 2018, respectively) | $ 0 |  |  |  | 19 |  |  | 27,263 |  |  |  |  | (27,282) |  |  |  |  |  |  |  |  |  |  |  |
Common shares issued during the period |  | $ 29,732 | $ 132,330 |  |  | $ 10 | $ 45 |  | $ 29,722 | $ 132,285 |  |  |  |  | $ 29,732 | $ 132,330 |  | $ 29,732 | $ 132,330 |  |  |  |  |  |
Common shares issued during the period (in shares) |  |  | 4,527,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 991,664 | 4,527,000 |  |  |  |  |  |
Share-based compensation issuance, net of redemptions (in units/shares) | 141,633 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 141,633 |  |  |  |  |  |  |  |
Share-based compensation issuance, net of redemptions (COPT: 176,477 and 141,633 shares issued, net of redemptions for the nine months ended September 30, 2017 and 2018, respectively) | $ 5,179 |  |  |  | 1 |  |  | 5,178 |  |  |  |  |  | 5,179 |  |  | $ 5,179 |  |  |  |  |  |  |  |
Redemption of vested equity awards | (1,611) |  |  |  |  |  |  | (1,611) |  |  |  |  |  | (1,611) |  |  | (1,611) |  |  |  |  |  |  |  |
Adjustments to noncontrolling interests resulting from changes in ownership of COPLP | 0 |  |  |  |  |  |  | (2,069) |  |  |  |  | 2,069 |  |  |  |  |  |  |  |  |  |  |  |
Comprehensive income | 66,188 |  |  |  |  |  |  |  |  |  | 55,281 | 7,665 | 3,242 | 66,188 |  |  | 56,813 |  |  | 7,904 | 976 |  | $ 495 |  | $ 0
Dividends / Distributions to owners of common and preferred units | (86,428) |  |  |  |  |  |  |  |  |  | (86,428) |  |  | (89,054) |  |  | (88,559) |  |  |  |  |  | $ (495) |  | $ 0
Distributions to owners of common and preferred units in COPLP | (2,626) |  |  |  |  |  |  |  |  |  |  |  | (2,626) |  |  |  |  |  |  |  |  |  |  |  |
Distributions to noncontrolling interests in subsidiaries | (11) |  |  |  |  |  |  |  |  |  |  |  | (11) | (11) |  |  |  |  |  |  | (11) |  |  |  |
Adjustment to arrive at fair value of redeemable noncontrolling interests | $ (1,331) |  |  |  |  |  |  | (1,331) |  |  |  |  |  | (1,331) |  |  | $ (1,331) |  |  |  |  |  |  |  |
Balance (in units/shares) at Sep. 30, 2018 | 108,848,223 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 110,203,474 |  |  |  |  | 1,355,251 |  | 108,848,223 |
Balance (preferred units) at Sep. 30, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 352,000 | 352,000 |  | 0
Balance (COPT: 99,608,170 shares and 108,848,223 shares as of September 30, 2017 and 2018, respectively) at Sep. 30, 2018 | $ 1,609,729 |  |  | $ 0 | $ 1,088 |  |  | $ 2,390,484 |  |  | $ (833,508) | $ 10,108 | $ 41,557 | $ 1,609,729 |  |  | $ 1,577,299 |  |  | $ 10,353 | $ 13,277 |  | $ 8,800 |  | $ 0

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- Definition Value of stock issued as a result of the exercise of stock options. + References Reference 1: 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=84159872&loc=d3e21463-112644 Reference 2: 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 3: 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 + Details
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