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Consolidated Statements of Equity - USD ($) $ in Thousands | Total | Common Shares [Member] | Preferred Shares [Member] | Common Shares [Member] | Additional Paid-in Capital [Member] | Additional Paid-in Capital [Member] Common Shares [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] Common Shares [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, 2014 | $ 1,520,884 |  | $ 199,083 | $ 933 | $ 1,969,968 |  | $ (717,264) | $ (1,297) | $ 69,461 | $ 1,520,884 | $ 1,305,219 | $ (1,381) | $ 9,163 |  | $ 8,800 |  | $ 199,083
Balance (in units/ shares) at Dec. 31, 2014 | 93,255,284 |  |  |  |  |  |  |  |  |  | 97,092,835 |  |  |  |  |  |
Balance (preferred units) at Dec. 31, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 352,000 |  | 7,431,667
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of common units to common shares (160,160, 87,000 and 339,513 shares in 2015, 2016 and 2017, respectively) | $ 0 |  |  | 2 | 2,149 |  |  |  | (2,151) |  |  |  |  |  |  |  |
Issuance of common units resulting from common shares issued under at-the-market program (in units) |  |  |  |  |  |  |  |  |  |  | 890,241 |  |  |  |  |  |
Issuance of common units resulting from common shares issued under at-the-market program (890,241, 3,721,227 and 591,042 shares in 2015, 2016 and 2017, respectively) |  | $ 26,535 |  | 9 |  | $ 26,526 |  |  |  | 26,535 | $ 26,535 |  |  |  |  |  |
Exercise of share options (in units/shares) | 76,474 |  |  |  |  |  |  |  |  |  | 76,474 |  |  |  |  |  |
Exercise of share options (76,474 and 5,000 shares in 2015 and 2017 respectively) | $ 2,008 |  |  |  | 2,008 |  |  |  |  | 2,008 | $ 2,008 |  |  |  |  |  |
Share-based compensation (149,353, 158,912 and 179,180 shares issued, net of redemptions in 2015, 2016 and 2017, respectively) | $ 7,398 |  |  | 1 | 7,397 |  |  |  |  | 7,398 | $ 7,398 |  |  |  |  |  |
Share-based compensation (in shares/units) | 149,353 |  |  |  |  |  |  |  |  |  | 149,353 |  |  |  |  |  |
Redemption of vested equity awards | $ (2,462) |  |  |  | (2,462) |  |  |  |  | (2,462) | $ (2,462) |  |  |  |  |  |
Adjustments to noncontrolling interests resulting from changes in ownership of COPLP | 0 |  |  |  | (682) |  |  |  | 682 |  |  |  |  |  |  |  |
Comprehensive income | 185,247 |  |  |  |  |  | 178,300 | (1,541) | 8,488 | 185,247 | 170,488 | (1,604) | 1,493 |  | $ 660 |  | $ 14,210
Dividends/Distributions | (118,208) |  |  |  |  |  | (118,208) |  |  | (122,914) | (108,044) |  |  |  | $ (660) |  | $ (14,210)
Distributions to owners of common and preferred units in COPLP | (4,706) |  |  |  |  |  |  |  | (4,706) |  |  |  |  |  |  |  |
Contributions from noncontrolling interests in other consolidated entities | 300 |  |  |  |  |  |  |  | 300 | 300 |  |  | 300 |  |  |  |
Distributions to noncontrolling interests in other consolidated entities | (35) |  |  |  |  |  |  |  | (35) | (35) |  |  | (35) |  |  |  |
Adjustment to arrive at fair value of redeemable noncontrolling interests | 116 |  |  |  | 116 |  |  |  |  | 116 | 116 |  |  |  |  |  |
Tax loss from share-based compensation | $ (513) |  |  |  | (513) |  |  |  |  | (513) | $ (513) |  |  |  |  |  |
Balance (preferred units) at Dec. 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 352,000 |  | 7,431,667
Balance (in units/ shares) at Dec. 31, 2015 | 94,531,512 |  |  |  |  |  |  |  |  |  | 98,208,903 |  |  |  |  |  |
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
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 (160,160, 87,000 and 339,513 shares in 2015, 2016 and 2017, respectively) | 0 |  |  | 1 | 1,166 |  |  |  | (1,167) |  |  |  |  |  |  |  |
Issuance of common units resulting from common shares issued under at-the-market program (in units) |  |  |  |  |  |  |  |  |  |  | 3,721,227 |  |  |  |  |  |
Issuance of common units resulting from common shares issued under at-the-market program (890,241, 3,721,227 and 591,042 shares in 2015, 2016 and 2017, respectively) | 109,053 |  |  | 37 | 109,016 |  |  |  |  | 109,053 | $ 109,053 |  |  |  |  |  |
Share-based compensation (149,353, 158,912 and 179,180 shares issued, net of redemptions in 2015, 2016 and 2017, 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 | 14,543 |  |  |  |  |  | 11,439 | 1,107 | 1,997 | 14,543 | (3,017) | 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 |  |  |  | 0 |  |  |  | 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 | 352,000 | 6,900,000 | 6,900,000
Balance (in units/ shares) at Dec. 31, 2016 | 98,498,651 |  |  |  |  |  |  |  |  |  | 102,089,042 |  |  | 3,590,391 |  | 98,498,651 |
Balance at Dec. 31, 2016 | $ 1,594,664 |  | $ 172,500 | 985 | 2,116,581 |  | (765,276) | (1,731) | 71,605 | 1,594,664 | $ 1,401,597 | (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 (160,160, 87,000 and 339,513 shares in 2015, 2016 and 2017, respectively) | 0 |  |  | 3 | 4,633 |  |  |  | (4,636) |  |  |  |  |  |  |  |
Common shares issued under forward equity sale agreements (1,678,913 shares) | 49,944 |  |  | 17 | 49,927 |  |  |  |  | 49,944 | $ (49,944) |  |  |  |  |  |
Issuance of common units resulting from COPT forward equity sale agreements (in shares) |  |  |  |  |  |  |  |  |  |  | 1,678,913 |  |  |  |  |  |
Issuance of common units resulting from common shares issued under at-the-market program (in units) |  |  |  |  |  |  |  |  |  |  | 591,042 |  |  |  |  |  |
Issuance of common units resulting from common shares issued under at-the-market program (890,241, 3,721,227 and 591,042 shares in 2015, 2016 and 2017, respectively) | $ 19,668 |  |  | 6 | 19,662 |  |  |  |  | 19,668 | $ 19,668 |  |  |  |  |  |
Exercise of share options (in units/shares) | 5,000 |  |  |  |  |  |  |  |  |  | 5,000 |  |  |  |  |  |
Exercise of share options (76,474 and 5,000 shares in 2015 and 2017 respectively) | $ 150 |  |  |  | 150 |  |  |  |  | 150 | $ 150 |  |  |  |  |  |
Share-based compensation (149,353, 158,912 and 179,180 shares issued, net of redemptions in 2015, 2016 and 2017, 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 | 78,022 |  |  |  |  |  | 70,091 | 3,898 | 4,033 | 78,022 | 65,808 | 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 | 0
Balance (in units/ shares) at Dec. 31, 2017 | 101,292,299 |  |  |  |  |  |  |  |  |  | 104,543,177.000 |  |  | 3,250,878 |  | 101,292,299 |
Balance at Dec. 31, 2017 | $ 1,451,586 |  | $ 0 | $ 1,013 | $ 2,201,047 |  | $ (818,190) | $ 2,167 | $ 65,549 | $ 1,451,586 | $ 1,428,301 | $ 2,173 | $ 12,312 |  | $ 8,800 |  | $ 0

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