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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 ($) | Cumulative Distributions in Excess of Net Income (Loss) USD ($) | 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, 2011 | $ 1,205,899 | $ 216,333 | $ 720 | $ 1,451,078 | $ (534,041) | $ (1,733) | $ 73,542 | $ 1,205,899 | $ 972,107 | $ (1,837) | $ 10,496 |  | $ 8,800 |  | $ 216,333
Balance (in shares) at Dec. 31, 2011 | 72,011,324 |  |  |  |  |  |  |  | 76,313,112 |  |  |  |  |  |
Balance (preferred units) at Dec. 31, 2011 |  |  |  |  |  |  |  |  |  |  |  |  | 352,000 |  | 8,121,667
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of common units to common shares (54,550 and 279,019 for the six months ended June 30, 2012 and 2013, respectively) |  |  |  | 696 |  |  | (696) |  |  |  |  |  |  |  |
Shares issued to the public (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,900,000
Shares issued to the public (in dollars) | 165,665 | 172,500 |  | (6,835) |  |  |  | 165,665 | (6,835) |  |  |  |  |  | 172,500
Costs associated with shares issued to the public | (5) |  |  | (5) |  |  |  | (5) | (5) |  |  |  |  |  |
Exercise of share options | 12,667 |  |  |  |  |  |  |  | 12,667 |  |  |  |  |  |
Exercise of share options (in dollars) | 189 |  |  | 189 |  |  |  | 189 | 189 |  |  |  |  |  |
Share-based compensation (shares) |  |  |  |  |  |  |  |  | 139,472 |  |  |  |  |  |
Share-based compensation | 7,181 |  | 1 | 7,180 |  |  |  | 7,181 | 7,181 |  |  |  |  |  |
Restricted common share redemptions | (133,081) |  |  |  |  |  |  |  | (133,081) |  |  |  |  |  |
Restricted common share redemptions | (3,219) |  |  | (3,219) |  |  |  | (3,219) | (3,219) |  |  |  |  |  |
Adjustments to noncontrolling interests resulting from changes in ownership of COPLP |  |  |  | 524 |  |  | (524) |  |  |  |  |  |  |  |
Comprehensive income | 21,029 |  |  |  | 21,600 | (1,984) | 1,413 | 21,029 | 14,145 | (2,099) | 461 |  | 330 |  | 8,192
Dividends | (47,821) |  |  |  | (47,821) |  |  | (50,493) | (41,971) |  |  |  | (330) |  | (8,192)
Distributions to owners of common and preferred units | (2,672) |  |  |  |  |  | (2,672) |  |  |  |  |  |  |  |
Distributions to noncontrolling interests |  |  |  |  |  |  |  | (648) |  |  | (648) |  |  |  |
Adjustment to arrive at fair value of noncontrolling interest | (1,827) |  |  | (1,827) |  |  |  | (1,827) | (1,827) |  |  |  |  |  |
Balance at Jun. 30, 2012 | 1,343,771 | 388,833 | 721 | 1,447,781 | (560,262) | (3,717) | 70,415 | 1,343,771 | 939,765 | (3,936) | 10,309 |  | 8,800 |  | 388,833
Balance (in shares) at Jun. 30, 2012 | 72,084,932 |  |  |  |  |  |  |  | 76,332,170 |  |  |  |  |  |
Balance (preferred units) at Jun. 30, 2012 |  |  |  |  |  |  |  |  |  |  |  |  | 352,000 |  | 15,021,667
Balance at Dec. 31, 2010 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions to noncontrolling interests |  |  |  |  |  |  | (648) |  |  |  |  |  |  |  |
Balance at Dec. 31, 2011 |  |  |  |  |  |  | 73,542 |  |  |  |  |  |  |  |
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 shares) at Dec. 31, 2012 | 80,952,986 |  |  |  |  |  |  |  | 85,020,528 |  |  | 4,067,542 |  | 80,952,986 |
Balance (preferred units) at Dec. 31, 2012 |  |  |  |  |  |  |  |  |  |  |  | 352,000 | 352,000 | 12,821,667 | 12,821,667
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of common units to common shares (54,550 and 279,019 for the six months ended June 30, 2012 and 2013, respectively) |  |  | 3 | 3,575 |  |  | (3,578) |  |  |  |  |  |  |  |
Shares issued to the public (in shares) |  |  |  |  |  |  |  |  | 4,485,000 |  |  |  |  |  |
Shares issued to the public (in dollars) | 117,913 |  | 45 | 117,868 |  |  |  | 117,913 | 117,913 |  |  |  |  |  |
Exercise of share options | 32,756 |  |  |  |  |  |  |  | 32,756 |  |  |  |  |  |
Exercise of share options (in dollars) | 636 |  |  | 636 |  |  |  | 636 | 636 |  |  |  |  |  |
Stock redeemed or called during period, value | (84,750) | (84,750) |  | 2,904 | (2,904) |  |  | (84,750) |  |  |  |  |  |  | (84,750)
Stock redeemed or called during period, shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,390,000)
Share-based compensation (shares) |  |  |  |  |  |  |  |  | 164,404 |  |  |  |  |  |
Share-based compensation | 3,848 |  | 1 | 3,847 |  |  |  | 3,848 | 3,848 |  |  |  |  |  |
Restricted common share redemptions | (68,762) |  |  |  |  |  |  |  | (68,762) |  |  |  |  |  |
Restricted common share redemptions | (1,784) |  |  | (1,784) |  |  |  | (1,784) | (1,784) |  |  |  |  |  |
Adjustments to noncontrolling interests resulting from changes in ownership of COPLP |  |  |  | (2,495) |  |  | 2,495 |  |  |  |  |  |  |  |
Comprehensive income | 20,211 |  |  |  | 9,655 | 9,066 | 1,490 | 20,211 | (1,586) | 9,471 | 1,005 |  | 330 |  | 10,991
Dividends | (58,188) |  |  |  | (58,188) |  |  | (60,610) | (49,289) |  |  |  | (330) |  | (10,991)
Distributions to owners of common and preferred units | (2,422) |  |  |  |  |  | (2,422) |  |  |  |  |  |  |  |
Distributions to noncontrolling interests | (8) |  |  |  |  |  | (8) | (8) |  |  | (8) |  |  |  |
Contributions from noncontrolling interests | 85 |  |  |  |  |  | 85 | 85 |  |  | 85 |  |  |  |
Adjustment to arrive at fair value of noncontrolling interest | (5,631) |  |  | (5,631) |  |  |  | (5,631) | (5,631) |  |  |  |  |  |
Increase in tax benefit 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 shares) at Jun. 30, 2013 | 85,845,403 |  |  |  |  |  |  |  | 89,633,926 |  |  | 3,788,523 |  | 85,845,403 |
Balance (preferred units) at Jun. 30, 2013 |  |  |  |  |  |  |  |  |  |  |  | 352,000 | 352,000 | 9,431,667 | 9,431,667

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