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Consolidated Statements of Equity - USD ($) $ in Thousands | Total | Forward Equity Sale Agreement | Common Shares | Common Shares Forward Equity Sale Agreement | Additional Paid-in Capital | 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. Forward Equity Sale Agreement | Corporate Office Properties, L.P. Common Shares | 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
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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 |  | $ 1,013 |  | $ 2,201,047 |  | (802,361) | 2,443 | $ 66,165 | $ 1,468,307 |  | 1,444,746 |  | 2,449 | $ 12,312 |  | $ 8,800
Balance (COPT: 101,292,299 and 110,241,868 shares as of December 31, 2017 and 2018, respectively) at Dec. 31, 2017 | $ 1,468,307 |  | 1,013 |  | 2,201,047 |  | (802,085) | 2,167 | 66,165 | 1,468,307 |  | $ 1,445,022 |  | 2,173 | 12,312 |  | $ 8,800
Balance (preferred units) at Dec. 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 352,000
Balance (in units/shares) at Dec. 31, 2017 | 101,292,299 |  |  |  |  |  |  |  |  |  |  | 104,543,177 |  |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of common units to common shares (COPT: 53,817 and 5,500 shares for the three months ended March 31, 2018 and 2019, respectively) | $ 0 |  | 1 |  | 760 |  |  |  | (761) |  |  |  |  |  |  |  |
Common shares issued under forward equity sale agreements (COPT: 677,000 and 1,614,087 shares for the three months ended March 31, 2018 and 2019, respectively) |  | $ 19,976 |  | $ 7 |  | $ 19,969 |  |  |  | 19,976 |  | $ 19,976 |  |  |  |  |
Common shares issued under forward equity sale agreements (in units/shares) |  | 677,000 |  |  |  |  |  |  |  |  |  | 677,000 |  |  |  |  |
Share-based compensation issuance, net of redemptions (in units/shares) | 127,242 |  |  |  |  |  |  |  |  |  |  | 127,242 |  |  |  |  |
Share-based compensation issuance, net of redemptions (COPT: 127,242 and 78,335 shares issued, net of redemptions for the three months ended March 31, 2018 and 2019, respectively) | $ 1,680 |  | 1 |  | 1,679 |  |  |  |  | 1,680 |  | $ 1,680 |  |  |  |  |
Redemption of vested equity awards | (1,327) |  |  |  | (1,327) |  |  |  |  | (1,327) |  | (1,327) |  |  |  |  |
Adjustments to noncontrolling interests resulting from changes in ownership of COPLP | 0 |  |  |  | (164) |  |  |  | 164 |  |  |  |  |  |  |  |
Comprehensive income | 23,063 |  |  |  |  |  | 17,150 | 4,761 | 1,152 | 23,063 |  | 17,694 |  | 4,921 | 283 |  | $ 165
Dividends/Distributions | (28,091) |  |  |  |  |  | (28,091) |  |  | (29,135) |  | (28,970) |  |  |  |  | $ (165)
Distributions to owners of common and preferred units in COPLP | (1,044) |  |  |  |  |  |  |  | (1,044) |  |  |  |  |  |  |  |
Distributions to noncontrolling interests in other consolidated entities/subsidiaries | (3) |  |  |  |  |  |  |  | (3) | (3) |  |  |  |  | (3) |  |
Adjustment to arrive at fair value of redeemable noncontrolling interests | $ (537) |  |  |  | (537) |  |  |  |  | (537) |  | $ (537) |  |  |  |  |
Balance (in units/shares) at Mar. 31, 2018 | 102,150,358 |  |  |  |  |  |  |  |  |  |  | 105,347,419 |  |  |  |  |
Balance (preferred units) at Mar. 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 352,000
Balance (COPT: 102,150,358 and 111,939,790 shares as of March 31, 2018 and 2019, respectively) at Mar. 31, 2018 | $ 1,482,024 |  | 1,022 |  | 2,221,427 |  | (813,302) | 7,204 | 65,673 | 1,482,024 |  | $ 1,453,262 |  | 7,370 | 12,592 |  | $ 8,800
Balance (COPT: 101,292,299 and 110,241,868 shares as of December 31, 2017 and 2018, respectively) at Dec. 31, 2018 | $ 1,627,048 |  | 1,102 |  | 2,431,355 |  | (846,808) | (238) | 41,637 | 1,627,048 |  | $ 1,604,655 |  | (121) | 13,714 |  | $ 8,800
Balance (preferred units) at Dec. 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 352,000 | 352,000
Balance (in units/shares) at Dec. 31, 2018 | 110,241,868 |  |  |  |  |  |  |  |  |  |  | 111,574,754 |  |  |  | 1,332,886 |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of common units to common shares (COPT: 53,817 and 5,500 shares for the three months ended March 31, 2018 and 2019, respectively) | $ 0 |  | 0 |  | 80 |  |  |  | (80) |  |  |  |  |  |  |  |
Common shares issued under forward equity sale agreements (COPT: 677,000 and 1,614,087 shares for the three months ended March 31, 2018 and 2019, respectively) |  | $ 46,454 |  | $ 16 |  | $ 46,438 |  |  |  |  | $ 46,454 |  | $ 46,454 |  |  |  |
Common shares issued under forward equity sale agreements (in units/shares) |  | 1,614,087 |  |  |  |  |  |  |  |  |  |  | 1,614,087 |  |  |  |
Share-based compensation issuance, net of redemptions (in units/shares) | 78,335 |  |  |  |  |  |  |  |  |  |  | 326,973 |  |  |  |  |
Share-based compensation issuance, net of redemptions (COPT: 127,242 and 78,335 shares issued, net of redemptions for the three months ended March 31, 2018 and 2019, respectively) | $ 1,802 |  | 1 |  | 1,562 |  |  |  | 239 | 1,802 |  | $ 1,802 |  |  |  |  |
Redemption of vested equity awards | (1,817) |  |  |  | (1,817) |  |  |  |  | (1,817) |  | (1,817) |  |  |  |  |
Adjustments to noncontrolling interests resulting from changes in ownership of COPLP | 0 |  |  |  | (1,322) |  |  |  | 1,322 |  |  |  |  |  |  |  |
Comprehensive income | 12,228 |  |  |  |  |  | 20,859 | (9,300) | 669 | 12,228 |  | 21,116 |  | (9,415) | 362 |  | $ 165
Dividends/Distributions | (30,754) |  |  |  |  |  | (30,754) |  |  | (31,304) |  | (31,139) |  |  |  |  | $ (165)
Distributions to owners of common and preferred units in COPLP | (550) |  |  |  |  |  |  |  | (550) |  |  |  |  |  |  |  |
Contributions from noncontrolling interests in other consolidated entities | 2,570 |  |  |  |  |  |  |  | 2,570 | 2,570 |  |  |  |  | 2,570 |  |
Distributions to noncontrolling interests in other consolidated entities/subsidiaries | (4) |  |  |  |  |  |  |  | (4) | (4) |  |  |  |  | (4) |  |
Adjustment to arrive at fair value of redeemable noncontrolling interests | $ (799) |  |  |  | (799) |  |  |  |  | (799) |  | $ (799) |  |  |  |  |
Balance (in units/shares) at Mar. 31, 2019 | 111,939,790 |  |  |  |  |  |  |  |  |  |  | 113,515,814 |  |  |  | 1,576,024 |
Balance (preferred units) at Mar. 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 352,000 | 352,000
Balance (COPT: 102,150,358 and 111,939,790 shares as of March 31, 2018 and 2019, respectively) at Mar. 31, 2019 | $ 1,656,178 |  | $ 1,119 |  | $ 2,475,497 |  | $ (856,703) | $ (9,538) | $ 45,803 | $ 1,656,178 |  | $ 1,640,272 |  | $ (9,536) | $ 16,642 |  | $ 8,800

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