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Summary of Significant Accounting Policies 2 (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012 | Dec. 31, 2011
Redeemable noncontrolling interest | $ 10,356 | $ 9,237 | $ 10,298 |
Preferred Shares, reported at par value |  | 0 |  |
Preferred Shares, reported at liquidation value | 333,833 | 216,333 | 333,833 |
Additional paid-in capital | 1,772,255 | 1,451,981 | 1,653,672 |
Cumulative distributions in excess of net income | (632,134) | (547,591) | (617,455) |
Noncontrolling interests in common units in the Operating Partnership | 50,604 | 53,999 | 52,122 |
Noncontrolling interest in other consolidated entities | 10,737 | 9,518 | 10,153 |
Total equity | 1,540,543 | 1,191,559 | 1,436,499 | 1,205,899
Total liabilities, redeemable noncontrolling interest and equity | 3,685,099 | 3,797,368 | 3,653,759 |
Revenues | 130,997 | 132,195 |  |
Expenses |  |  |  |
Property operating expenses | 42,575 | 41,253 |  |
Depreciation and amortization associated with real estate operations | 28,252 | 27,834 |  |
Construction contract and other service expenses | 13,477 | 20,607 |  |
Impairment losses (recoveries) | 1,857 | (4,836) |  |
General, administrative and leasing expenses |  | 9,569 |  |
Business development expenses and land carry costs | 1,359 | 1,576 |  |
Total operating expenses | 95,340 | 96,003 |  |
Operating income | 35,657 | 36,192 |  |
Interest expense | (22,307) | (24,431) |  |
Income tax (expense) benefit | (16) | (204) |  |
Income from continuing operations | 9,137 | 12,685 |  |
Discontinued operations | 3,786 | (2,450) |  |
Net income | 15,277 | 10,235 |  |
Net income attributable to noncontrolling interests in common units in the Operating Partnership | (429) | (373) |  |
Net income attributable to noncontrolling interests in other consolidated entities | 337 | 598 |  |
Net income attributable to Corporate Office Properties Trust | 15,020 | 10,295 |  |
Basic and diluted earnings per common share: |  |  |  |
Income from continuing operations (in dollars per share) |  | $ 0.12 |  |
Income from discontinued operations (in dollars per share) |  | $ (0.03) |  |
Net income attributable to COPT common shareholders (in dollars per share) |  | $ 0.09 |  |
Scenario, Previously Reported |  |  |  |
Redeemable noncontrolling interest |  | 0 |  |
Preferred Shares, reported at par value |  | 81 |  |
Preferred Shares, reported at liquidation value |  | 0 |  |
Additional paid-in capital |  | 1,670,451 |  |
Cumulative distributions in excess of net income |  | (549,456) |  |
Noncontrolling interests in common units in the Operating Partnership |  | 53,883 |  |
Noncontrolling interest in other consolidated entities |  | 18,518 |  |
Total equity |  | 1,200,796 |  |
Total liabilities, redeemable noncontrolling interest and equity |  | 3,797,368 |  |
Revenues |  | 143,473 |  |
Expenses |  |  |  |
Property operating expenses |  | 47,202 |  |
Depreciation and amortization associated with real estate operations |  | 31,066 |  |
Construction contract and other service expenses |  | 20,607 |  |
Impairment losses (recoveries) |  | 5,126 |  |
General, administrative and leasing expenses |  | 7,017 |  |
Business development expenses and land carry costs |  | 1,594 |  |
Total operating expenses |  | 112,612 |  |
Operating income |  | 30,861 |  |
Interest expense |  | (25,224) |  |
Income tax (expense) benefit |  | (4,173) |  |
Income from continuing operations |  | 2,592 |  |
Discontinued operations |  | 4,385 |  |
Net income |  | 6,977 |  |
Net income attributable to noncontrolling interests in common units in the Operating Partnership |  | (159) |  |
Net income attributable to noncontrolling interests in other consolidated entities |  | 24 |  |
Net income attributable to Corporate Office Properties Trust |  | 6,677 |  |
Basic and diluted earnings per common share: |  |  |  |
Income from continuing operations (in dollars per share) |  | $ (0.02) |  |
Income from discontinued operations (in dollars per share) |  | $ 0.06 |  |
Net income attributable to COPT common shareholders (in dollars per share) |  | $ 0.04 |  |
Change |  |  |  |
Redeemable noncontrolling interest |  | 9,237 |  |
Preferred Shares, reported at par value |  | (81) |  |
Preferred Shares, reported at liquidation value |  | 216,333 |  |
Additional paid-in capital |  | (218,470) |  |
Cumulative distributions in excess of net income |  | 1,865 |  |
Noncontrolling interests in common units in the Operating Partnership |  | 116 |  |
Noncontrolling interest in other consolidated entities |  | (9,000) |  |
Total equity |  | (9,237) |  |
Revenues |  | (11,278) |  |
Expenses |  |  |  |
Property operating expenses |  | (5,949) |  |
Depreciation and amortization associated with real estate operations |  | (3,232) |  |
Impairment losses (recoveries) |  | (9,962) |  |
General, administrative and leasing expenses |  | 2,552 |  |
Business development expenses and land carry costs |  | (18) |  |
Total operating expenses |  | (16,609) |  |
Operating income |  | 5,331 |  |
Interest expense |  | 793 |  |
Income tax (expense) benefit |  | 3,969 |  |
Income from continuing operations |  | 10,093 |  |
Discontinued operations |  | (6,835) |  |
Net income |  | 3,258 |  |
Net income attributable to noncontrolling interests in common units in the Operating Partnership |  | (214) |  |
Net income attributable to noncontrolling interests in other consolidated entities |  | 574 |  |
Net income attributable to Corporate Office Properties Trust |  | 3,618 |  |
Basic and diluted earnings per common share: |  |  |  |
Income from continuing operations (in dollars per share) |  | $ 0.14 |  |
Income from discontinued operations (in dollars per share) |  | $ (0.09) |  |
Net income attributable to COPT common shareholders (in dollars per share) |  | $ 0.05 |  |
Reclassifications |  |  |  |
Preferred Shares, reported at par value |  | (81) |  |
Preferred Shares, reported at liquidation value |  | 216,333 |  |
Additional paid-in capital |  | (216,252) |  |
Revisions |  |  |  |
Redeemable noncontrolling interest |  | 9,237 |  |
Additional paid-in capital |  | (2,218) |  |
Cumulative distributions in excess of net income |  | 1,865 |  |
Noncontrolling interests in common units in the Operating Partnership |  | 116 |  |
Noncontrolling interest in other consolidated entities |  | (9,000) |  |
Total equity |  | (9,237) |  |
Continuing Operations | Reclassifications |  |  |  |
Expenses |  |  |  |
Property operating expenses |  | (1,841) |  |
General, administrative and leasing expenses |  | 1,841 |  |
Continuing Operations | Revisions |  |  |  |
Expenses |  |  |  |
General, administrative and leasing expenses |  | 711 |  |
Total operating expenses |  | 711 |  |
Operating income |  | (711) |  |
Income tax (expense) benefit |  | 3,969 |  |
Income from continuing operations |  | 3,258 |  |
Net income |  | 3,258 |  |
Net income attributable to noncontrolling interests in common units in the Operating Partnership |  | (214) |  |
Net income attributable to noncontrolling interests in other consolidated entities |  | 574 |  |
Net income attributable to Corporate Office Properties Trust |  | 3,618 |  |
Basic and diluted earnings per common share: |  |  |  |
Income from continuing operations (in dollars per share) |  | $ 0.05 |  |
Net income attributable to COPT common shareholders (in dollars per share) |  | $ 0.05 |  |
Discontinued Operations | Reclassifications |  |  |  |
Revenues |  | (11,278) |  |
Expenses |  |  |  |
Property operating expenses |  | (4,108) |  |
Depreciation and amortization associated with real estate operations |  | (3,232) |  |
Impairment losses (recoveries) |  | (9,962) |  |
Business development expenses and land carry costs |  | (18) |  |
Total operating expenses |  | (17,320) |  |
Operating income |  | 6,042 |  |
Interest expense |  | 793 |  |
Income from continuing operations |  | 6,835 |  |
Discontinued operations |  | $ (6,835) |  |
Basic and diluted earnings per common share: |  |  |  |
Income from continuing operations (in dollars per share) |  | $ 0.09 |  |
Income from discontinued operations (in dollars per share) |  | $ (0.09) |  |

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