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Consolidated Statements of Equity (USD $)
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Total
USD ($)
|
Preferred Shares
USD ($)
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Common Shares
USD ($)
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Additional Paid-in Capital
USD ($)
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Cumulative Distributions in Excess of Net Income
USD ($)
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Accumulated Other Comprehensive Income (Loss)
USD ($)
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Noncontrolling Interests
USD ($)
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Corporate Office Properties, L.P.
USD ($)
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Corporate Office Properties, L.P.
Common Shares
USD ($)
|
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 | $ 1,436,499,000 | $ 333,833,000 | $ 809,000 | $ 1,653,672,000 | $ (617,455,000) | $ (5,435,000) | $ 71,075,000 | $ 1,436,499,000 | $ 1,089,391,000 | $ (5,708,000) | $ 10,183,000 | $ 8,800,000 | $ 333,833,000 | ||
| 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) | (84,750,000) | (84,750,000) | 2,904,000 | (2,904,000) | (84,750,000) | (84,750,000) | |||||||||
| Conversion of common units to common shares (310,889 and 117,149 for the nine months ended September 30, 2013 and 2014, respectively) | 0 | 3,000 | 3,988,000 | (3,991,000) | |||||||||||
| Shares issued to the public (in dollars) | 117,961,000 | 45,000 | 117,916,000 | 117,961,000 | 117,961,000 | ||||||||||
| 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) | 38,447,000 | 15,000 | 38,432,000 | 38,447,000 | |||||||||||
| 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) | 1,369,000 | 3,899,000 | (2,530,000) | ||||||||||||
| Acquisition of property and noncontrolling interest in other consolidated entity for COPLP common units | 1,369,000 | (1,296,000) | 2,665,000 | ||||||||||||
| 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) | 642,000 | 642,000 | 642,000 | 642,000 | |||||||||||
| Share-based compensation (in units/shares) | 171,287 | ||||||||||||||
| Share-based compensation | 2,000 | ||||||||||||||
| Share-based compensation | 5,700,000 | ||||||||||||||
| Share-based compensation | 5,702,000 | 5,702,000 | 5,702,000 | ||||||||||||
| Restricted common units/shares redemptions (in units/shares) | (71,523) | (71,523) | |||||||||||||
| Restricted common units/shares redemptions (in dollars) | (1,848,000) | (1,848,000) | (1,848,000) | (1,848,000) | |||||||||||
| Adjustments to noncontrolling interests resulting from changes in ownership of COPLP | 0 | (773,000) | 773,000 | ||||||||||||
| Comprehensive income (loss) | 16,885,000 | 6,691,000 | 8,360,000 | 1,834,000 | 16,885,000 | (9,276,000) | 8,734,000 | 1,451,000 | 495,000 | 15,481,000 | |||||
| Dividends/Distributions | (86,700,000) | (86,700,000) | (90,381,000) | (74,405,000) | (495,000) | (15,481,000) | |||||||||
| Distributions to owners of common and preferred units in COPLP | (3,681,000) | (3,681,000) | |||||||||||||
| Contributions from noncontrolling interests in other consolidated entities | 85,000 | 85,000 | 85,000 | 85,000 | |||||||||||
| Distributions to noncontrolling interests in other consolidated entities | (8,000) | (8,000) | (8,000) | (8,000) | |||||||||||
| Adjustment to arrive at fair value of redeemable noncontrolling interest | (6,414,000) | (6,414,000) | (6,414,000) | (6,414,000) | |||||||||||
| Tax loss from share-based compensation | (122,000) | (122,000) | (122,000) | (122,000) | |||||||||||
| Balance at Sep. 30, 2013 | 1,434,067,000 | 249,083,000 | 874,000 | 1,812,801,000 | (700,368,000) | 2,925,000 | 68,752,000 | 1,434,067,000 | 1,163,977,000 | 3,026,000 | 9,181,000 | 8,800,000 | 249,083,000 | ||
| Balance (in units/ shares) at Sep. 30, 2013 | 87,381,395 | 91,359,549 | |||||||||||||
| Balance (preferred units) at Sep. 30, 2013 | 352,000 | 9,431,667 | |||||||||||||
| Balance at Dec. 31, 2013 | 1,497,249,000 | 249,083,000 | 874,000 | 1,814,015,000 | (641,868,000) | 3,480,000 | 71,665,000 | 1,497,249,000 | 1,226,318,000 | 3,605,000 | 9,443,000 | 8,800,000 | 249,083,000 | ||
| 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) | (50,000,000) | (50,000,000) | 1,769,000 | (1,769,000) | (50,000,000) | (50,000,000) | |||||||||
| Conversion of common units to common shares (310,889 and 117,149 for the nine months ended September 30, 2013 and 2014, respectively) | 0 | 1,000 | 1,544,000 | (1,545,000) | |||||||||||
| Shares issued to the public (in dollars) | (7,000) | (7,000) | (7,000) | (7,000) | |||||||||||
| Exercise of share options (in units/shares) | 57,888 | 57,888 | |||||||||||||
| Exercise of share options (in dollars) | 1,359,000 | 1,359,000 | 1,359,000 | 1,359,000 | |||||||||||
| Share-based compensation (in units/shares) | 193,863 | ||||||||||||||
| Share-based compensation | 2,000 | ||||||||||||||
| Share-based compensation | 5,247,000 | ||||||||||||||
| Share-based compensation | 5,249,000 | 5,249,000 | 5,249,000 | ||||||||||||
| Restricted common units/shares redemptions (in units/shares) | (51,681) | (51,681) | |||||||||||||
| Restricted common units/shares redemptions (in dollars) | (1,389,000) | (1,389,000) | (1,389,000) | (1,389,000) | |||||||||||
| Adjustments to noncontrolling interests resulting from changes in ownership of COPLP | 0 | (248,000) | 248,000 | ||||||||||||
| Comprehensive income (loss) | 35,055,000 | 35,351,000 | (2,609,000) | 2,313,000 | 35,055,000 | 23,916,000 | (2,726,000) | 983,000 | 495,000 | 12,387,000 | |||||
| Dividends/Distributions | (84,692,000) | (84,692,000) | (88,402,000) | (75,520,000) | (495,000) | (12,387,000) | |||||||||
| Distributions to owners of common and preferred units in COPLP | (3,710,000) | (3,710,000) | |||||||||||||
| Contributions from noncontrolling interests in other consolidated entities | 3,000 | 3,000 | 3,000 | 3,000 | |||||||||||
| Distributions to noncontrolling interests in other consolidated entities | (1,606,000) | (1,606,000) | (1,606,000) | (1,606,000) | |||||||||||
| Adjustment to arrive at fair value of redeemable noncontrolling interest | (7,000) | (7,000) | (7,000) | (7,000) | |||||||||||
| Balance at Sep. 30, 2014 | $ 1,397,504,000 | $ 199,083,000 | $ 877,000 | $ 1,822,283,000 | $ (692,978,000) | $ 871,000 | $ 67,368,000 | $ 1,397,504,000 | $ 1,179,919,000 | $ 879,000 | $ 8,823,000 | $ 8,800,000 | $ 199,083,000 | ||
| Balance (in units/ shares) at Sep. 30, 2014 | 87,711,731 | 91,572,282.000 | 3,860,551 | 87,711,731 | |||||||||||
| Balance (preferred units) at Sep. 30, 2014 | 352,000 | 352,000 | 7,431,667 | 7,431,667 |