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Consolidated Statements of Equity (USD $) In Thousands, except Share data, unless otherwise specified | Total USD ($) | Preferred Shares USD ($) | Common Shares USD ($) | Additional Paid-in Capital USD ($) | Cumulative Distributions in Excess of Net Income USD ($) | Accumulated Other Comprehensive Income (Loss) USD ($) | Noncontrolling Interests USD ($) | Corporate Office Properties, L.P. USD ($) | Corporate Office Properties, L.P. Common Shares USD ($) | Corporate Office Properties, L.P. Accumulated Other Comprehensive Income (Loss) USD ($) | Corporate Office Properties, L.P. Noncontrolling Interests USD ($) | Corporate Office Properties, L.P. Limited Partner | Corporate Office Properties, L.P. Limited Partner Preferred Shares USD ($) | Corporate Office Properties, L.P. General Partner | Corporate Office Properties, L.P. General Partner Preferred Shares USD ($)
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Balance at Dec. 31, 2012 | $ 1,436,499 | $ 333,833 | $ 809 | $ 1,653,672 | $ (617,455) | $ (5,435) | $ 71,075 | $ 1,436,499 | $ 1,089,391 | $ (5,708) | $ 10,183 |  | $ 8,800 |  | $ 333,833
Balance (in units/ shares) at Dec. 31, 2012 | 80,952,986 |  |  |  |  |  |  |  | 85,020,528 |  |  |  |  |  |
Balance (preferred units) at Dec. 31, 2012 |  |  |  |  |  |  |  |  |  |  |  |  | 352,000 |  | 12,821,667
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption of preferred shares (in units/ shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,390,000)
Redemption of preferred shares (in dollars) | (84,750) | (84,750) |  | 2,904 | (2,904) |  |  | (84,750) |  |  |  |  |  |  | (84,750)
Conversion of common units to common shares (279,019 and 78,498 for the six months ended June 30, 2013 and 2014, respectively) | 0 |  | 3 | 3,575 |  |  | (3,578) |  |  |  |  |  |  |  |
Shares issued to the public (in dollars) | 117,913 |  | 45 | 117,868 |  |  |  | 117,913 | 117,913 |  |  |  |  |  |
Shares issued to the public (in units/ shares) |  |  |  |  |  |  |  |  | 4,485,000 |  |  |  |  |  |
Exercise of share options (in units/shares) | 32,756 |  |  |  |  |  |  |  | 32,756 |  |  |  |  |  |
Exercise of share options (in dollars) | 636 |  |  | 636 |  |  |  | 636 | 636 |  |  |  |  |  |
Share-based compensation (in units/shares) |  |  |  |  |  |  |  |  | 164,404 |  |  |  |  |  |
Share-based compensation |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation |  |  |  | 3,847 |  |  |  |  |  |  |  |  |  |  |
Share-based compensation | 3,848 |  |  |  |  |  |  | 3,848 | 3,848 |  |  |  |  |  |
Restricted common units/shares redemptions (in units/shares) | (68,762) |  |  |  |  |  |  |  | (68,762) |  |  |  |  |  |
Restricted common units/shares redemptions (in dollars) | (1,784) |  |  | (1,784) |  |  |  | (1,784) | (1,784) |  |  |  |  |  |
Adjustments to noncontrolling interests resulting from changes in ownership of COPLP | 0 |  |  | (2,495) |  |  | 2,495 |  |  |  |  |  |  |  |
Comprehensive income (loss) | 20,211 |  |  |  | 9,655 | 9,066 | 1,490 | 20,211 | (1,586) | 9,471 | 1,005 |  | 330 |  | 10,991
Dividends/Distributions | (58,188) |  |  |  | (58,188) |  |  | (60,610) | (49,289) |  |  |  | (330) |  | (10,991)
Distributions to owners of common and preferred units in COPLP | (2,422) |  |  |  |  |  | (2,422) |  |  |  |  |  |  |  |
Contributions from noncontrolling interests in other consolidated entities | 85 |  |  |  |  |  | 85 | 85 |  |  | 85 |  |  |  |
Distributions to noncontrolling interests in other consolidated entities | (8) |  |  |  |  |  | (8) | (8) |  |  | (8) |  |  |  |
Adjustment to arrive at fair value of redeemable noncontrolling interest | (5,631) |  |  | (5,631) |  |  |  | (5,631) | (5,631) |  |  |  |  |  |
Tax loss from share-based compensation | (122) |  |  | (122) |  |  |  | (122) | (122) |  |  |  |  |  |
Balance at Jun. 30, 2013 | 1,426,287 | 249,083 | 858 | 1,772,470 | (668,892) | 3,631 | 69,137 | 1,426,287 | 1,153,376 | 3,763 | 11,265 |  | 8,800 |  | 249,083
Balance (in units/ shares) at Jun. 30, 2013 | 85,845,403 |  |  |  |  |  |  |  | 89,633,926 |  |  |  |  |  |
Balance (preferred units) at Jun. 30, 2013 |  |  |  |  |  |  |  |  |  |  |  |  | 352,000 |  | 9,431,667
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 |  |  | 3,977,700 |  | 87,394,512 |
Balance (preferred units) at Dec. 31, 2013 |  |  |  |  |  |  |  |  |  |  |  | 352,000 | 352,000 | 9,431,667 | 9,431,667
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption of preferred shares (in units/ shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2,000,000)
Redemption of preferred shares (in dollars) | (50,000) | (50,000) |  | 1,769 | (1,769) |  |  | (50,000) |  |  |  |  |  |  | (50,000)
Conversion of common units to common shares (279,019 and 78,498 for the six months ended June 30, 2013 and 2014, respectively) | 0 |  |  | 1,047 |  |  | (1,047) |  |  |  |  |  |  |  |
Shares issued to the public (in dollars) | (7) |  |  | (7) |  |  |  | (7) | (7) |  |  |  |  |  |
Exercise of share options (in units/shares) | 51,289 |  |  |  |  |  |  |  | 51,289 |  |  |  |  |  |
Exercise of share options (in dollars) | 1,185 |  |  | 1,185 |  |  |  | 1,185 | 1,185 |  |  |  |  |  |
Share-based compensation (in units/shares) |  |  |  |  |  |  |  |  | 193,463 |  |  |  |  |  |
Share-based compensation |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation |  |  |  | 3,542 |  |  |  |  |  |  |  |  |  |  |
Share-based compensation | 3,545 |  |  |  |  |  |  | 3,545 | 3,545 |  |  |  |  |  |
Restricted common units/shares redemptions (in units/shares) | (49,454) |  |  |  |  |  |  |  | (49,454) |  |  |  |  |  |
Restricted common units/shares redemptions (in dollars) | (1,326) |  |  | (1,326) |  |  |  | (1,326) | (1,326) |  |  |  |  |  |
Adjustments to noncontrolling interests resulting from changes in ownership of COPLP | 0 |  |  | (72) |  |  | 72 |  |  |  |  |  |  |  |
Comprehensive income (loss) | 9,366 |  |  |  | 12,631 | (4,241) | 976 | 9,366 | 3,983 | (4,430) | 649 |  | 330 |  | 8,834
Dividends/Distributions | (57,027) |  |  |  | (57,027) |  |  | (59,510) | (50,346) |  |  |  | (330) |  | (8,834)
Distributions to owners of common and preferred units in COPLP | (2,483) |  |  |  |  |  | (2,483) |  |  |  |  |  |  |  |
Contributions from noncontrolling interests in other consolidated entities | 3 |  |  |  |  |  | 3 | 3 |  |  | 3 |  |  |  |
Distributions to noncontrolling interests in other consolidated entities | (8) |  |  |  |  |  | (8) | (8) |  |  | (8) |  |  |  |
Adjustment to arrive at fair value of redeemable noncontrolling interest | (717) |  |  | (717) |  |  |  | (717) | (717) |  |  |  |  |  |
Balance at Jun. 30, 2014 | $ 1,399,780 | $ 199,083 | $ 877 | $ 1,819,436 | $ (688,033) | $ (761) | $ 69,178 | $ 1,399,780 | $ 1,182,635 | $ (825) | $ 10,087 |  | $ 8,800 |  | $ 199,083
Balance (in units/ shares) at Jun. 30, 2014 | 87,668,308 |  |  |  |  |  |  |  | 91,567,510 |  |  | 3,899,202 |  | 87,668,308 |
Balance (preferred units) at Jun. 30, 2014 |  |  |  |  |  |  |  |  |  |  |  | 352,000 | 352,000 | 7,431,667 | 7,431,667

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