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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, 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 units/ 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 (94,550 and 310,889 for the nine months ended September 30, 2012 and 2013, respectively) |  |  | 1 | 1,187 |  |  | (1,188) |  |  |  |  |  |  |  |
Shares issued to the public (in dollars) | 165,662 | 172,500 |  | (6,838) |  |  |  | 165,662 | (6,838) |  |  |  |  |  | 172,500
Shares issued to the public (in units/ shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,900,000
Stock redeemed or called during period (in units/ shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2,200,000)
Stock redeemed or called during period, value | (55,000) | (55,000) |  | 1,827 | (1,827) |  |  | (55,000) |  |  |  |  |  |  | (55,000)
Costs associated with common units/shares issued to the public | (5) |  |  | (5) |  |  |  | (5) | (5) |  |  |  |  |  |
Exercise of share options (in units/shares) | 44,624 |  |  |  |  |  |  |  | 44,624 |  |  |  |  |  |
Exercise of share options (in dollars) | 666 |  |  | 666 |  |  |  | 666 | 666 |  |  |  |  |  |
Share-based compensation (in units/shares) |  |  |  |  |  |  |  |  | 142,914 |  |  |  |  |  |
Share-based compensation | 9,192 |  | 1 | 9,191 |  |  |  | 9,192 | 9,192 |  |  |  |  |  |
Restricted common unts/shares redemptions | (135,777) |  |  |  |  |  |  |  | (135,777) |  |  |  |  |  |
Restricted common units/shares redemptions (in dollars) | (3,279) |  |  | (3,279) |  |  |  | (3,279) | (3,279) |  |  |  |  |  |
Adjustments to noncontrolling interests resulting from changes in ownership of COPLP |  |  |  | 373 |  |  | (373) |  |  |  |  |  |  |  |
Comprehensive income (loss) | (1,218) |  |  |  | 2,438 | (3,955) | 299 | (1,218) | (13,735) | (4,182) | 1,466 |  | 495 |  | 14,738
Dividends/Distributions | (74,203) |  |  |  | (74,203) |  |  | (78,196) | (62,963) |  |  |  | (495) |  | (14,738)
Distributions to owners of common and preferred units in COPLP | (3,993) |  |  |  |  |  | (3,993) |  |  |  |  |  |  |  |
Contributions from noncontrolling interests |  |  |  |  |  |  |  |  | (1,602) |  | (1,602) |  |  |  |
Distributions to noncontrolling interests | (648) |  |  |  |  |  | (648) | (648) |  |  | (648) |  |  |  |
Adjustment to arrive at fair value of redeemable noncontrolling interest | (2,827) |  |  | (2,827) |  |  |  | (2,827) | (2,827) |  |  |  |  |  |
Increase in tax benefit from share-based compensation | 43 |  |  | 43 |  |  |  | 43 | 43 |  |  |  |  |  |
Balance at Sep. 30, 2012 | 1,240,289 | 333,833 | 722 | 1,451,416 | (607,633) | (5,688) | 67,639 | 1,240,289 | 893,963 | (6,019) | 9,712 |  | 8,800 |  | 333,833
Balance (in units/ shares) at Sep. 30, 2012 | 72,157,635 |  |  |  |  |  |  |  | 76,364,873 |  |  |  |  |  |
Balance (preferred units) at Sep. 30, 2012 |  |  |  |  |  |  |  |  |  |  |  |  | 352,000 |  | 12,821,667
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 |  |  | 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 (94,550 and 310,889 for the nine months ended September 30, 2012 and 2013, respectively) |  |  | 3 | 3,988 |  |  | (3,991) |  |  |  |  |  |  |  |
Shares issued to the public (in dollars) | 117,961 |  | 45 | 117,916 |  |  |  | 117,961 | 117,961 |  |  |  |  |  |
Shares issued to the public (in units/ shares) |  |  |  |  |  |  |  |  | 4,485,000 |  |  |  |  |  |
Stock redeemed or called during period (in units/ shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,390,000)
Stock redeemed or called during period, value | (84,750) | (84,750) |  | 2,904 | (2,904) |  |  | (84,750) |  |  |  |  |  |  | (84,750)
Issuance of common units resulting from common shares issued under at-the-market program (in units) |  |  |  |  |  |  |  |  | 1,500,000 |  |  |  |  |  |
Issuance of common units resulting from common shares issued under at-the-market program (in dollars) | 38,447 |  | 15 | 38,432 |  |  |  | 38,447 | 38,447 |  |  |  |  |  |
Acquisition of property and noncontrolling interest in other consolidated entity for COPLP common units | 1,369 |  |  | (1,296) |  |  | 2,665 |  |  |  |  |  |  |  |
Acquisition of property and noncontrolling interest in other consolidated entity for COPLP common units (in units) |  |  |  |  |  |  |  |  | 221,501 |  |  |  |  |  |
Acquisition of property and noncontrolling interest in other consolidated entity for COPLP common units (in dollars) |  |  |  |  |  |  |  | 1,369 | 3,899 |  | (2,530) |  |  |  |
Exercise of share options (in units/shares) | 32,756 |  |  |  |  |  |  |  | 32,756 |  |  |  |  |  |
Exercise of share options (in dollars) | 642 |  |  | 642 |  |  |  | 642 | 642 |  |  |  |  |  |
Share-based compensation (in units/shares) |  |  |  |  |  |  |  |  | 171,287 |  |  |  |  |  |
Share-based compensation | 5,702 |  | 2 | 5,700 |  |  |  | 5,702 | 5,702 |  |  |  |  |  |
Restricted common unts/shares redemptions | (71,523) |  |  |  |  |  |  |  | (71,523) |  |  |  |  |  |
Restricted common units/shares redemptions (in dollars) | (1,848) |  |  | (1,848) |  |  |  | (1,848) | (1,848) |  |  |  |  |  |
Adjustments to noncontrolling interests resulting from changes in ownership of COPLP |  |  |  | (773) |  |  | 773 |  |  |  |  |  |  |  |
Comprehensive income (loss) | 16,885 |  |  |  | 6,691 | 8,360 | 1,834 | 16,885 | (9,276) | 8,734 | 1,451 |  | 495 |  | 15,481
Dividends/Distributions | (86,700) |  |  |  | (86,700) |  |  | (90,381) | (74,405) |  |  |  | (495) |  | (15,481)
Distributions to owners of common and preferred units in COPLP | (3,681) |  |  |  |  |  | (3,681) |  |  |  |  |  |  |  |
Contributions from noncontrolling interests | 85 |  |  |  |  |  | 85 | 85 |  |  | 85 |  |  |  |
Distributions to noncontrolling interests | (8) |  |  |  |  |  | (8) | (8) |  |  | (8) |  |  |  |
Adjustment to arrive at fair value of redeemable noncontrolling interest | (6,414) |  |  | (6,414) |  |  |  | (6,414) | (6,414) |  |  |  |  |  |
Increase in tax benefit from share-based compensation | (122) |  |  | (122) |  |  |  | (122) | (122) |  |  |  |  |  |
Balance at Sep. 30, 2013 | $ 1,434,067 | $ 249,083 | $ 874 | $ 1,812,801 | $ (700,368) | $ 2,925 | $ 68,752 | $ 1,434,067 | $ 1,163,977 | $ 3,026 | $ 9,181 |  | $ 8,800 |  | $ 249,083
Balance (in units/ shares) at Sep. 30, 2013 | 87,381,395 |  |  |  |  |  |  |  | 91,359,549 |  |  | 3,978,154 |  | 87,381,395 |
Balance (preferred units) at Sep. 30, 2013 |  |  |  |  |  |  |  |  |  |  |  | 352,000 | 352,000 | 9,431,667 | 9,431,667

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