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Consolidated Statements of Equity - USD ($) $ in Thousands | Total | Forward Equity Sale Agreement [Member] | Common Stock Issued to Public Under At-the-Market Program [Member] | Common Shares [Member] Common Stock Issued to Public Under At-the-Market Program [Member] | Preferred Shares [Member] | Preferred Shares [Member] Preferred Shares [Member] | Common Shares [Member] | Common Shares [Member] Forward Equity Sale Agreement [Member] | Common Shares [Member] Common Stock Issued to Public Under At-the-Market Program [Member] | Additional Paid-in Capital [Member] | Additional Paid-in Capital [Member] Forward Equity Sale Agreement [Member] | Additional Paid-in Capital [Member] Common Stock Issued to Public Under At-the-Market Program [Member] | Additional Paid-in Capital [Member] Common Shares [Member] Common Stock Issued to Public Under At-the-Market Program [Member] | Cumulative Distributions in Excess of Net Income [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Noncontrolling Interests [Member] | Corporate Office Properties, L.P. [Member] | Corporate Office Properties, L.P. [Member] Forward Equity Sale Agreement [Member] | Corporate Office Properties, L.P. [Member] Common Stock Issued to Public Under At-the-Market Program [Member] | Corporate Office Properties, L.P. [Member] Common Shares [Member] | Corporate Office Properties, L.P. [Member] Common Shares [Member] Forward Equity Sale Agreement [Member] | Corporate Office Properties, L.P. [Member] Common Shares [Member] Common Stock Issued to Public Under At-the-Market Program [Member] | Corporate Office Properties, L.P. [Member] Accumulated Other Comprehensive Income (Loss) [Member] | Corporate Office Properties, L.P. [Member] Noncontrolling Interests [Member] | Corporate Office Properties, L.P. [Member] Limited Partner [Member] | Corporate Office Properties, L.P. [Member] Limited Partner [Member] Preferred Shares [Member] | Corporate Office Properties, L.P. [Member] General Partner [Member] | Corporate Office Properties, L.P. [Member] General Partner [Member] Preferred Shares [Member]
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Balance at Dec. 31, 2015 | $ 1,616,564 |  |  |  | $ 199,083 |  | $ 945 |  |  | $ 2,004,507 |  |  |  | $ (657,172) | $ (2,838) | $ 72,039 | $ 1,616,564 |  |  | $ 1,400,745 |  |  | $ (2,985) | $ 10,921 |  | $ 8,800 |  | $ 199,083
Balance (in units/ shares) at Dec. 31, 2015 | 94,531,512 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 98,208,903 |  |  |  |  |  |  |  |
Balance (preferred units) at Dec. 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 352,000 |  | 7,431,667
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption of preferred shares/units |  |  |  |  |  | (531,667) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (531,667)
Redemption of preferred shares/units (531,667 and 6,900,000 shares in 2016 and 2017, respectively) | $ (26,583) |  |  |  | (26,583) |  |  |  |  | 17 |  |  |  | (17) |  |  | (26,583) |  |  |  |  |  |  |  |  |  |  | $ (26,583)
Conversion of common units to common shares (87,000, 339,513 and 1,904,615 shares in 2016, 2017 and 2018, respectively) | 0 |  |  |  |  |  | 1 |  |  | 1,166 |  |  |  |  |  | (1,167) |  |  |  |  |  |  |  |  |  |  |  |
Common shares issued during the period (in units/shares) |  |  | 3,721,227 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,721,227 |  |  |  |  |  |
Common shares issued during the period |  |  |  | $ 109,053 |  |  |  |  | $ 37 |  |  |  | $ 109,016 |  |  |  |  |  | $ 109,053 |  |  | $ 109,053 |  |  |  |  |  |
Share-based compensation (158,912, 179,180 and 146,290 shares issued, net of redemptions in 2016, 2017 and 2018, respectively) | $ 7,453 |  |  |  |  |  | 2 |  |  | 7,451 |  |  |  |  |  |  | 7,453 |  |  | $ 7,453 |  |  |  |  |  |  |  |
Share-based compensation (in shares/units) | 158,912 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 158,912 |  |  |  |  |  |  |  |
Redemption of vested equity awards | $ (2,466) |  |  |  |  |  |  |  |  | (2,466) |  |  |  |  |  |  | (2,466) |  |  | $ (2,466) |  |  |  |  |  |  |  |
Adjustments to noncontrolling interests resulting from changes in ownership of COPLP | 0 |  |  |  |  |  |  |  |  | (2,158) |  |  |  |  |  | 2,158 |  |  |  |  |  |  |  |  |  |  |  |
Comprehensive income | 32,656 |  |  |  |  |  |  |  |  |  |  |  |  | 28,890 | 1,107 | 2,659 | 32,656 |  |  | 15,096 |  |  | 1,131 | 1,472 |  | $ 660 |  | 14,297
Dividends/Distributions | (119,526) |  |  |  |  |  |  |  |  |  |  |  |  | (119,526) |  |  | (124,176) |  |  | (109,219) |  |  |  |  |  | $ (660) |  | $ (14,297)
Distributions to owners of common and preferred units in COPLP | (4,650) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (4,650) |  |  |  |  |  |  |  |  |  |  |  |
Contributions from noncontrolling interests in other consolidated entities | 1,244 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,244 | 1,244 |  |  |  |  |  |  | 1,244 |  |  |  |
Distributions to noncontrolling interests in other consolidated entities | (16) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (16) | (16) |  |  |  |  |  |  | (16) |  |  |  |
Adjustment to arrive at fair value of redeemable noncontrolling interests | (621) |  |  |  |  |  |  |  |  | (621) |  |  |  |  |  |  | (621) |  |  | (621) |  |  |  |  |  |  |  |
Tax loss from share-based compensation | $ (331) |  |  |  |  |  |  |  |  | (331) |  |  |  |  |  |  | (331) |  |  | $ (331) |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
Balance 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
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption of preferred shares/units |  |  |  |  |  | (6,900,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (6,900,000)
Redemption of preferred shares/units (531,667 and 6,900,000 shares in 2016 and 2017, respectively) | (172,500) |  |  |  | (172,500) |  |  |  |  | 6,847 |  |  |  | (6,847) |  |  | (172,500) |  |  |  |  |  |  |  |  |  |  | $ (172,500)
Conversion of common units to common shares (87,000, 339,513 and 1,904,615 shares in 2016, 2017 and 2018, respectively) | $ 0 |  |  |  |  |  | 3 |  |  | 4,633 |  |  |  |  |  | (4,636) |  |  |  |  |  |  |  |  |  |  |  |
Common shares issued during the period (in units/shares) |  | 1,678,913 | 591,042 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,678,913 |  | 591,042 |  |  |  |  |  |
Common shares issued during the period |  | $ 49,944 | $ 19,668 |  |  |  |  | $ 17 | 6 |  | $ 49,927 | $ 19,662 |  |  |  |  | 49,944 |  | 19,668 | $ 49,944 |  | $ 19,668 |  |  |  |  |  |
Exercise of share options (in units/shares) | 5,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000 |  |  |  |  |  |  |  |
Exercise of share options (5,000 shares in 2017) | $ 150 |  |  |  |  |  | 0 |  |  | 150 |  |  |  |  |  |  | 150 |  |  | $ 150 |  |  |  |  |  |  |  |
Share-based compensation (158,912, 179,180 and 146,290 shares issued, net of redemptions in 2016, 2017 and 2018, respectively) | $ 6,095 |  |  |  |  |  | 2 |  |  | 6,093 |  |  |  |  |  |  | 6,095 |  |  | $ 6,095 |  |  |  |  |  |  |  |
Share-based compensation (in shares/units) | 179,180 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 179,180 |  |  |  |  |  |  |  |
Redemption of vested equity awards | $ (1,973) |  |  |  |  |  |  |  |  | (1,973) |  |  |  |  |  |  | (1,973) |  |  | $ (1,973) |  |  |  |  |  |  |  |
Adjustments to noncontrolling interests resulting from changes in ownership of COPLP | 0 |  |  |  |  |  |  |  |  | (1,486) |  |  |  |  |  | 1,486 |  |  |  |  |  |  |  |  |  |  |  |
Comprehensive income | 76,630 |  |  |  |  |  |  |  |  |  |  |  |  | 68,745 | 3,898 | 3,987 | 76,630 |  |  | 64,416 |  |  | 4,027 | 1,308 |  | 660 |  | 6,219
Dividends/Distributions | (116,158) |  |  |  |  |  |  |  |  |  |  |  |  | (116,158) |  |  | (120,480) |  |  | (113,601) |  |  |  |  |  | $ (660) |  | $ (6,219)
Distributions to owners of common and preferred units in COPLP | (4,322) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (4,322) |  |  |  |  |  |  |  |  |  |  |  |
Distributions to noncontrolling interests in other consolidated entities | (2,617) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2,617) | (2,617) |  |  |  |  |  |  | (2,617) |  |  |  |
Adjustment to arrive at fair value of redeemable noncontrolling interests | 626 |  |  |  |  |  |  |  |  | 626 |  |  |  |  |  |  | 626 |  |  | 626 |  |  |  |  |  |  |  |
Tax loss from share-based compensation | $ (13) |  |  |  |  |  |  |  |  | (13) |  |  |  |  |  |  | (13) |  |  | $ (13) |  |  |  |  |  |  |  |
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 |
Balance 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
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
Conversion of common units to common shares (87,000, 339,513 and 1,904,615 shares in 2016, 2017 and 2018, respectively) | 0 |  |  |  |  |  | 19 |  |  | 27,394 |  |  |  |  |  | (27,413) |  |  |  |  |  |  |  |  |  |  |  |
Redemption of common units (in units) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (13,377) |  |  |  |  |  |  |  |
Redemption of common units | (339) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (339) | (339) |  |  | $ (339) |  |  |  |  |  |  |  |
Common shares issued during the period (in units/shares) |  | 5,907,000 | 991,664 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,907,000 | 991,664 |  |  |  |  |  |
Common shares issued during the period |  | $ 172,294 | $ 29,732 |  |  |  |  | $ 59 | $ 10 |  | $ 172,235 | $ 29,722 |  |  |  |  |  | $ 172,294 | $ 29,732 |  | $ 172,294 | $ 29,732 |  |  |  |  |  |
Share-based compensation (158,912, 179,180 and 146,290 shares issued, net of redemptions in 2016, 2017 and 2018, respectively) | $ 6,963 |  |  |  |  |  | 1 |  |  | 6,962 |  |  |  |  |  |  | 6,963 |  |  | $ 6,963 |  |  |  |  |  |  |  |
Share-based compensation (in shares/units) | 146,290 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 146,290 |  |  |  |  |  |  |  |
Redemption of vested equity awards | $ (1,702) |  |  |  |  |  |  |  |  | (1,702) |  |  |  |  |  |  | (1,702) |  |  | $ (1,702) |  |  |  |  |  |  |  |
Adjustments to noncontrolling interests resulting from changes in ownership of COPLP | 0 |  |  |  |  |  |  |  |  | (2,466) |  |  |  |  |  | 2,466 |  |  |  |  |  |  |  |  |  |  |  |
Comprehensive income | 73,550 |  |  |  |  |  |  |  |  |  |  |  |  | 72,301 | (2,681) | 3,930 | 73,550 |  |  | 74,043 |  |  | (2,570) | 1,417 |  | 660 |  | 0
Dividends/Distributions | (116,748) |  |  |  |  |  |  |  |  |  |  |  |  | (116,748) |  |  | (119,905) |  |  | (119,245) |  |  |  |  |  | $ (660) |  | $ 0
Distributions to owners of common and preferred units in COPLP | (3,157) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,157) |  |  |  |  |  |  |  |  |  |  |  |
Distributions to noncontrolling interests in other consolidated entities | (15) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (15) | (15) |  |  |  |  |  |  | (15) |  |  |  |
Adjustment to arrive at fair value of redeemable noncontrolling interests | $ (1,837) |  |  |  |  |  |  |  |  | (1,837) |  |  |  |  |  |  | (1,837) |  |  | $ (1,837) |  |  |  |  |  |  |  |
Balance (preferred units) at Dec. 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 352,000 | 352,000 |  | 0
Balance (in units/ shares) at Dec. 31, 2018 | 110,241,868 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 111,574,754.000 |  |  |  |  | 1,332,886 |  | 110,241,868 |
Balance at Dec. 31, 2018 | $ 1,627,048 |  |  |  | $ 0 |  | $ 1,102 |  |  | $ 2,431,355 |  |  |  | $ (846,808) | $ (238) | $ 41,637 | $ 1,627,048 |  |  | $ 1,604,655 |  |  | $ (121) | $ 13,714 |  | $ 8,800 |  | $ 0

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