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Consolidated Statements of Equity (USD $) In Thousands, except Share data, unless otherwise specified | Total USD ($) | Preferred Shares USD ($) | Common Shares USD ($) | Preferred Shares USD ($) | Common Shares USD ($) | Additional Paid-in Capital USD ($) | Additional Paid-in Capital Preferred Shares USD ($) | Additional Paid-in Capital Common Shares USD ($) | Cumulative Distributions in Excess of Net Income USD ($) | Accumulated Other Comprehensive Loss USD ($) | Noncontrolling Interests USD ($) | Corporate Office Properties, L.P. USD ($) | Corporate Office Properties, L.P. Preferred Shares USD ($) | Corporate Office Properties, L.P. Common Shares USD ($) | Corporate Office Properties, L.P. Common Shares USD ($) | Corporate Office Properties, L.P. Common Shares Preferred Shares USD ($) | Corporate Office Properties, L.P. Common Shares USD ($) | Corporate Office Properties, L.P. Accumulated Other Comprehensive 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 ($) | Corporate Office Properties, L.P. General Partner | Corporate Office Properties, L.P. General Partner Preferred Shares USD ($) | Corporate Office Properties, L.P. General Partner Preferred Shares USD ($)
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Balance at Dec. 31, 2010 | $ 1,314,138 |  |  | $ 216,333 | $ 669 | $ 1,295,592 |  |  | $ (281,794) | $ (4,163) | $ 87,501 | $ 1,314,825 |  |  | $ 1,083,963 |  |  | $ (4,447) | $ 10,176 |  | $ 8,800 |  | $ 216,333 |
Balance (in units/ shares) at Dec. 31, 2010 | 66,931,582 |  |  |  |  |  |  |  |  |  |  |  |  |  | 69,668,226 |  |  |  |  |  |  |  |  |
Balance (preferred units) at Dec. 31, 2010 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 352,000 |  | 8,121,667 |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of common units to common shares (100,939, 234,246 and 311,343 shares in 2011, 2012 and 2013, respectively) | 0 |  |  |  | 1 | 1,520 |  |  |  |  | (1,521) |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common units to COPT to balance units owned with common shares | 100,939 |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,666,083 |  |  |  |  |  |  |  |  |
Shares issued to the public (in dollars) | 145,367 |  |  |  | 46 | 145,321 |  |  |  |  |  | 145,367 |  |  | 145,367 |  |  |  |  |  |  |  |  |
Shares issued to the public (in units/shares) | 4,600,000 |  | 4,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise of share options (in dollars) | 2,461 |  |  |  | 2 | 2,459 |  |  |  |  |  | 2,461 |  |  | 2,461 |  |  |  |  |  |  |  |  |
Share-based compensation (in units/shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 302,226 |  |  |  |  |  |  |  |  |
Exercise of share options (in units/shares) | 191,264 |  |  |  |  |  |  |  |  |  |  |  |  |  | 191,264 |  |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  | 14,265 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation | 14,267 |  |  |  |  |  |  |  |  |  |  | 14,267 |  |  | 14,267 |  |  |  |  |  |  |  |  |
Restricted common units/shares redemptions | (114,687) |  |  |  |  |  |  |  |  |  |  |  |  |  | (114,687) |  |  |  |  |  |  |  |  |
Restricted common units/shares redemptions (in dollars) | (3,990) |  |  |  |  | (3,990) |  |  |  |  |  | (3,990) |  |  | (3,990) |  |  |  |  |  |  |  |  |
Adjustments to noncontrolling interests resulting from changes in ownership of COPLP | 0 |  |  |  |  | (2,798) |  |  |  |  | 2,798 |  |  |  |  |  |  |  |  |  |  |  |  |
Comprehensive income (loss) | (124,669) |  |  |  |  |  |  |  | (119,428) | 2,430 | (7,671) | (124,664) |  |  | (144,088) |  |  | 2,610 | 52 |  | 660 |  | 16,102 |
Dividends/Distributions | (132,819) |  |  |  |  |  |  |  | (132,819) |  |  | (141,344) |  |  | (124,582) |  |  |  |  |  | (660) |  | (16,102) |
Distributions to owners of common and preferred units in COPLP | (7,833) |  |  |  |  |  |  |  |  |  | (7,833) |  |  |  |  |  |  |  |  |  |  |  |  |
Contributions from noncontrolling interests | 261 |  |  |  |  | (23) |  |  |  |  | 284 | 261 |  |  | (23) |  |  |  | 284 |  |  |  |  |
Distributions to noncontrolling interests | (16) |  |  |  |  |  |  |  |  |  | (16) | (16) |  |  |  |  |  |  | (16) |  |  |  |  |
Adjustment to arrive at fair value of redeemable noncontrolling interest | (1,315) |  |  |  |  | (1,315) |  |  |  |  |  | (1,315) |  |  | (1,315) |  |  |  |  |  |  |  |  |
Tax benefit (loss) from share-based compensation | 47 |  |  |  |  | 47 |  |  |  |  |  | 47 |  |  | 47 |  |  |  |  |  |  |  |  |
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 (100,939, 234,246 and 311,343 shares in 2011, 2012 and 2013, respectively) | 0 |  |  |  | 2 | 2,812 |  |  |  |  | (2,814) |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common units to COPT to balance units owned with common shares | 234,246 |  |  |  |  |  |  |  |  |  |  | 234,246 |  |  |  |  |  |  |  |  |  |  |  |
Shares issued to the public (in dollars) |  | 165,652 | 204,696 | 172,500 | 86 |  | (6,848) | 204,610 |  |  |  |  | 165,652 | 204,696 |  | (6,848) | 204,696 |  |  |  |  |  |  | 172,500
Shares issued to the public (in units/shares) |  | 6,900,000 | 8,625,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,625,000 |  |  |  |  |  |  | 6,900,000
Stock redeemed or called during period (in units/ shares) | (55,000) |  |  | (55,000) |  | 1,827 |  |  | (1,827) |  |  | (55,000) |  |  |  |  |  |  |  |  |  |  | (55,000) |
Stock redeemed or called during period, value |  | (2,200,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2,200,000) |
Exercise of share options (in dollars) | 928 |  |  |  | 0 | 928 |  |  |  |  |  | 928 |  |  | 928 |  |  |  |  |  |  |  |  |
Share-based compensation (in units/shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 160,643 |  |  |  |  |  |  |  |  |
Exercise of share options (in units/shares) | 61,624 |  |  |  |  |  |  |  |  |  |  |  |  |  | 61,624 |  |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  | 11,183 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation | 11,184 |  |  |  |  |  |  |  |  |  |  | 11,184 |  |  | 11,184 |  |  |  |  |  |  |  |  |
Restricted common units/shares redemptions | (139,851) |  |  |  |  |  |  |  |  |  |  |  |  |  | (139,851) |  |  |  |  |  |  |  |  |
Restricted common units/shares redemptions (in dollars) | (3,379) |  |  |  |  | (3,379) |  |  |  |  |  | (3,379) |  |  | (3,379) |  |  |  |  |  |  |  |  |
Adjustments to noncontrolling interests resulting from changes in ownership of COPLP | 0 |  |  |  |  | (4,627) |  |  |  |  | 4,627 |  |  |  |  |  |  |  |  |  |  |  |  |
Comprehensive income (loss) | 18,927 |  |  |  |  |  |  |  | 20,977 | (3,702) | 1,652 | 18,927 |  |  | (656) |  |  | (3,871) | 1,950 |  | 660 |  | 20,844 |
Dividends/Distributions | (102,564) |  |  |  |  |  |  |  | (102,564) |  |  | (107,841) |  |  | (86,337) |  |  |  |  |  | (660) |  | (20,844) |
Distributions to owners of common and preferred units in COPLP | (5,277) |  |  |  |  |  |  |  |  |  | (5,277) |  |  |  |  |  |  |  |  |  |  |  |  |
COPT contribution to COPLP of distribution from subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,608 |  |  |  | (1,608) |  |  |  |  |
Distributions to noncontrolling interests | (655) |  |  |  |  |  |  |  |  |  | (655) | (655) |  |  |  |  |  |  | (655) |  |  |  |  |
Adjustment to arrive at fair value of redeemable noncontrolling interest | (3,955) |  |  |  |  | (3,955) |  |  |  |  |  | (3,955) |  |  | (3,955) |  |  |  |  |  |  |  |  |
Tax benefit (loss) from share-based compensation | 43 |  |  |  |  | 43 |  |  |  |  |  | 43 |  |  | 43 |  |  |  |  |  |  |  |  |
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 (100,939, 234,246 and 311,343 shares in 2011, 2012 and 2013, respectively) | 0 |  |  |  | 3 | 3,994 |  |  |  |  | (3,997) |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common units to COPT to balance units owned with common shares | 311,343 |  |  |  |  |  |  |  |  |  |  | 311,343 |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  | 4,485,000 |  |  |  |  |  |  |  |  |
Stock redeemed or called during period (in units/ shares) | (84,750) |  |  | (84,750) |  | 2,904 |  |  | (2,904) |  |  | (84,750) |  |  |  |  |  |  |  |  |  |  | (84,750) |
Stock redeemed or called during period, value |  | (3,390,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,390,000) |
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 dollars) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 221,501 |  |  |  |  |  |  |  |  |
Acquisition of property and noncontrolling interest in other consolidated entity for COPLP common units (in units) |  |  |  |  |  |  |  |  |  |  |  | 1,369 |  |  | 3,899 |  |  |  | (2,530) |  |  |  |  |
Exercise of share options (in dollars) | 779 |  |  |  |  | 779 |  |  |  |  |  | 779 |  |  | 779 |  |  |  |  |  |  |  |  |
Share-based compensation (in units/shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 184,292 |  |  |  |  |  |  |  |  |
Exercise of share options (in units/shares) | 39,331 |  |  |  |  |  |  |  |  |  |  |  |  |  | 39,331 |  |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  | 7,603 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation | 7,605 |  |  |  |  |  |  |  |  |  |  | 7,605 |  |  | 7,605 |  |  |  |  |  |  |  |  |
Restricted common units/shares redemptions | (78,440) |  |  |  |  |  |  |  |  |  |  |  |  |  | (78,440) |  |  |  |  |  |  |  |  |
Restricted common units/shares redemptions (in dollars) | (2,002) |  |  |  |  | (2,002) |  |  |  |  |  | (2,002) |  |  | (2,002) |  |  |  |  |  |  |  |  |
Adjustments to noncontrolling interests resulting from changes in ownership of COPLP | 0 |  |  |  |  | (744) |  |  |  |  | 744 |  |  |  |  |  |  |  |  |  |  |  |  |
Comprehensive income (loss) | 109,699 |  |  |  |  |  |  |  | 93,707 | 8,915 | 7,077 | 109,699 |  |  | 77,006 |  |  | 9,313 | 2,749 |  | 660 |  | 19,971 |
Dividends/Distributions | (115,216) |  |  |  |  |  |  |  | (115,216) |  |  | (120,156) |  |  | (99,525) |  |  |  |  |  | (660) |  | (19,971) |
Distributions to owners of common and preferred units in COPLP | (4,940) |  |  |  |  |  |  |  |  |  | (4,940) |  |  |  |  |  |  |  |  |  |  |  |  |
Contributions from noncontrolling interests | 86 |  |  |  |  |  |  |  |  |  | 86 | 86 |  |  |  |  |  |  | 86 |  |  |  |  |
Distributions to noncontrolling interests | (1,045) |  |  |  |  |  |  |  |  |  | (1,045) | (1,045) |  |  |  |  |  |  | (1,045) |  |  |  |  |
Adjustment to arrive at fair value of redeemable noncontrolling interest | (7,121) |  |  |  |  | (7,121) |  |  |  |  |  | (7,121) |  |  | (7,121) |  |  |  |  |  |  |  |  |
Tax benefit (loss) from share-based compensation | (122) |  |  |  |  | (122) |  |  |  |  |  | (122) |  |  | (122) |  |  |  |  |  |  |  |  |
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 |

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