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Consolidated Statements of Equity - USD ($) $ in Thousands | Total | Preferred Shares [Member] | Common Shares [Member] | Additional Paid-in Capital [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, 2013 | $ 1,497,249 | $ 249,083 | $ 874 | $ 1,814,015 | $ (641,868) | $ 3,480 | $ 71,665 | $ 1,497,249 | $ 1,226,318 | $ 3,605 | $ 9,443 |  | $ 8,800 |  | $ 249,083
Balance (in units/ shares) at Dec. 31, 2013 | 87,394,512 |  |  |  |  |  |  |  | 91,372,212 |  |  |  |  |  |
Balance (preferred units) at Dec. 31, 2013 |  |  |  |  |  |  |  |  |  |  |  |  | 352,000 |  | 9,431,667
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption of preferred shares/units |  | (2,000,000) |  |  |  |  |  |  |  |  |  |  |  |  | (2,000,000)
Redemption of preferred shares/units (2,000,000 shares in 2014 and 531,667 shares in 2016, respectively) | $ (50,000) | $ (50,000) |  | 1,769 | (1,769) |  |  | (50,000) |  |  |  |  |  |  | $ (50,000)
Conversion of common units to common shares (140,149, 160,160 and 87,000 shares in 2014, 2015 and 2016 respectively) | 0 |  | 2 | 1,841 |  |  | (1,843) |  |  |  |  |  |  |  |
Shares issued to the public (5,520,000 common shares in 2014, respectively) | $ 148,666 |  | $ 55 | 148,611 |  |  |  | 148,666 | $ 148,666 |  |  |  |  |  |
Shares issued to the public (in units/shares) |  |  | 5,520,000 |  |  |  |  |  | 5,520,000 |  |  |  |  |  |
Exercise of share options (in units/shares) | 62,888 |  |  |  |  |  |  |  | 62,888 |  |  |  |  |  |
Exercise of share options (62,888, 76,474 and shares in 2014 and 2015 respectively) | $ 1,489 |  |  | 1,489 |  |  |  | 1,489 | $ 1,489 |  |  |  |  |  |
Share-based compensation (137,735, 149,353 and 158,912 shares issued, net of redemptions in 2014, 2015 and 2016 respectively) | $ 7,050 |  | $ 2 | 7,048 |  |  |  | 7,050 | $ 7,050 |  |  |  |  |  |
Share-based compensation (in shares/units) | 137,735 |  |  |  |  |  |  |  | 137,735 |  |  |  |  |  |
Redemption of vested equity awards | $ (1,554) |  |  | (1,554) |  |  |  | (1,554) | $ (1,554) |  |  |  |  |  |
Adjustments to noncontrolling interests resulting from changes in ownership of COPLP | 0 |  |  | (3,382) |  |  | 3,382 |  |  |  |  |  |  |  |
Comprehensive income | 38,274 |  |  |  | 40,255 | (4,777) | 2,796 | 38,274 | 25,331 | (4,986) | 1,330 |  | $ 660 |  | 15,939
Dividends/Distributions | (113,882) |  |  |  | (113,882) |  |  | (118,811) | (102,212) |  |  |  | $ (660) |  | $ (15,939)
Distributions to owners of common and preferred units in COPLP | (4,929) |  |  |  |  |  | (4,929) |  |  |  |  |  |  |  |
Contributions from noncontrolling interests in other consolidated entities | 3 |  |  |  |  |  | 3 | 3 |  |  | 3 |  |  |  |
Distributions to noncontrolling interests in other consolidated entities | (1,613) |  |  |  |  |  | (1,613) | (1,613) |  |  | (1,613) |  |  |  |
Adjustment to arrive at fair value of redeemable noncontrolling interests | 134 |  |  | 134 |  |  |  | 134 | 134 |  |  |  |  |  |
Tax loss from share-based compensation | $ (3) |  |  | (3) |  |  |  | (3) | $ (3) |  |  |  |  |  |
Balance (preferred units) at Dec. 31, 2014 |  |  |  |  |  |  |  |  |  |  |  |  | 352,000 |  | 7,431,667
Balance (in units/ shares) at Dec. 31, 2014 | 93,255,284 |  |  |  |  |  |  |  | 97,092,835 |  |  |  |  |  |
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
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption of preferred shares/units |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of common units to common shares (140,149, 160,160 and 87,000 shares in 2014, 2015 and 2016 respectively) | 0 |  | $ 2 | 2,149 |  |  | (2,151) |  |  |  |  |  |  |  |
Shares issued to the public (in units/shares) |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
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 shares in 2015 and 3,721,227 shares in 2016) | $ 26,535 |  | $ 9 | 26,526 |  |  |  | 26,535 | $ 26,535 |  |  |  |  |  |
Exercise of share options (in units/shares) | 76,474 |  |  |  |  |  |  |  | 76,474 |  |  |  |  |  |
Exercise of share options (62,888, 76,474 and shares in 2014 and 2015 respectively) | $ 2,008 |  |  | 2,008 |  |  |  | 2,008 | $ 2,008 |  |  |  |  |  |
Share-based compensation (137,735, 149,353 and 158,912 shares issued, net of redemptions in 2014, 2015 and 2016 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 | 352,000 | 7,431,667 | 7,431,667
Balance (in units/ shares) at Dec. 31, 2015 | 94,531,512 |  |  |  |  |  |  |  | 98,208,903 |  |  | 3,677,391 |  | 94,531,512 |
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 (2,000,000 shares in 2014 and 531,667 shares in 2016, respectively) | (26,583) | $ (26,583) |  | 17 | (17) |  |  | 26,583 |  |  |  |  |  |  | $ (26,583)
Conversion of common units to common shares (140,149, 160,160 and 87,000 shares in 2014, 2015 and 2016 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 shares in 2015 and 3,721,227 shares in 2016) | 109,053 |  | 37 | 109,016 |  |  |  | 109,053 | $ 109,053 |  |  |  |  |  |
Share-based compensation (137,735, 149,353 and 158,912 shares issued, net of redemptions in 2014, 2015 and 2016 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 |  |  |  |  |  | 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 |  |  |  |  |  |  |  | 102,089,042.000 |  |  | 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

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