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Summary of Significant Accounting Policies 2 (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2011
Redeemable noncontrolling interest | $ 15,571 | $ 9,578 | $ 15,571 | $ 9,578 | $ 10,298 |
Additional paid-in capital | 1,772,470 | 1,447,781 | 1,772,470 | 1,447,781 | 1,653,672 |
Cumulative distributions in excess of net income | (668,892) | (560,262) | (668,892) | (560,262) | (617,455) |
Noncontrolling interests in common units in COPLP | 49,112 | 52,300 | 49,112 | 52,300 | 52,122 |
Noncontrolling interests in other consolidated entities | 11,225 | 9,315 | 11,225 | 9,315 | 10,153 |
Total equity | 1,426,287 | 1,343,771 | 1,426,287 | 1,343,771 | 1,436,499 | 1,205,899
Total liabilities, redeemable noncontrolling interest and equity | 3,699,635 | 3,715,075 | 3,699,635 | 3,715,075 | 3,653,759 |
Total revenues | 140,524 | 127,664 | 271,144 | 259,398 |  |
Expenses |  |  |  |  |  |
Property operating expenses | 43,408 | 39,441 | 85,927 | 80,628 |  |
Depreciation and amortization associated with real estate operations | 28,866 | 28,295 | 57,029 | 56,029 |  |
Construction contract and other service expenses | 19,382 | 16,285 | 32,859 | 36,892 |  |
Impairment recoveries | 0 | 0 | 0 | (4,836) |  |
General, administrative and leasing expenses |  | 8,851 |  | 18,420 |  |
Business development expenses and land carry costs | 1,327 | 1,298 | 2,686 | 2,874 |  |
Total operating expenses | 99,566 | 94,170 | 192,904 | 190,007 |  |
Operating income | 40,958 | 33,494 | 78,240 | 69,391 |  |
Interest expense | (23,302) | (24,239) | (45,609) | (48,670) |  |
Income tax expense | (21) | (17) | (37) | (221) |  |
Income from continuing operations | (1,703) | 9,722 | 9,059 | 22,112 |  |
Discontinued operations | (3,031) | 2,118 | (870) | (37) |  |
Net income | (4,405) | 11,861 | 10,872 | 22,096 |  |
Net income attributable to noncontrolling interests in common units in COPLP | 671 | (422) | 242 | (795) |  |
Net income attributable to noncontrolling interests in other consolidated entities | (1,466) | 31 | (1,129) | 629 |  |
Net income attributable to Corporate Office Properties Trust | (5,365) | 11,305 | 9,655 | 21,600 |  |
Basic and diluted earnings per common share: |  |  |  |  |  |
Income from continuing operations (in dollars per share) |  | $ 0.07 |  | $ 0.18 |  |
Income from discontinued operations (in dollars per share) |  | $ 0.03 |  | $ 0.00 |  |
Net income attributable to COPT common shareholders (in dollars per share) |  | $ 0.10 |  | $ 0.18 |  |
Scenario, Previously Reported |  |  |  |  |  |
Redeemable noncontrolling interest |  | 0 |  | 0 |  |
Additional paid-in capital |  | 1,450,923 |  | 1,450,923 |  |
Cumulative distributions in excess of net income |  | (562,678) |  | (562,678) |  |
Noncontrolling interests in common units in COPLP |  | 52,152 |  | 52,152 |  |
Noncontrolling interests in other consolidated entities |  | 18,315 |  | 18,315 |  |
Total equity |  | 1,353,349 |  | 1,353,349 |  |
Total liabilities, redeemable noncontrolling interest and equity |  | 3,715,075 |  | 3,715,075 |  |
Total revenues |  | 133,386 |  | 270,996 |  |
Expenses |  |  |  |  |  |
Property operating expenses |  | 42,384 |  | 87,301 |  |
Depreciation and amortization associated with real estate operations |  | 29,853 |  | 59,172 |  |
Construction contract and other service expenses |  | 16,285 |  | 36,892 |  |
Impairment recoveries |  |  |  | (2,303) |  |
General, administrative and leasing expenses |  | 7,742 |  | 14,759 |  |
Business development expenses and land carry costs |  | 1,298 |  | 2,874 |  |
Total operating expenses |  | 97,562 |  | 198,695 |  |
Operating income |  | 35,824 |  | 72,301 |  |
Interest expense |  | (24,747) |  | (49,667) |  |
Income tax expense |  | (17) |  | (4,190) |  |
Income from continuing operations |  | 11,544 |  | 20,056 |  |
Discontinued operations |  | 296 |  | (1,239) |  |
Net income |  | 11,861 |  | 18,838 |  |
Net income attributable to noncontrolling interests in common units in COPLP |  | (390) |  | (549) |  |
Net income attributable to noncontrolling interests in other consolidated entities |  | (552) |  | (528) |  |
Net income attributable to Corporate Office Properties Trust |  | 10,754 |  | 17,431 |  |
Basic and diluted earnings per common share: |  |  |  |  |  |
Income from continuing operations (in dollars per share) |  | $ 0.09 |  | $ 0.14 |  |
Income from discontinued operations (in dollars per share) |  |  |  | $ (0.01) |  |
Net income attributable to COPT common shareholders (in dollars per share) |  | $ 0.09 |  | $ 0.13 |  |
Change |  |  |  |  |  |
Redeemable noncontrolling interest |  | 9,578 |  | 9,578 |  |
Additional paid-in capital |  | (3,142) |  | (3,142) |  |
Cumulative distributions in excess of net income |  | 2,416 |  | 2,416 |  |
Noncontrolling interests in common units in COPLP |  | 148 |  | 148 |  |
Noncontrolling interests in other consolidated entities |  | (9,000) |  | (9,000) |  |
Total equity |  | (9,578) |  | (9,578) |  |
Total revenues |  | (5,722) |  | (11,598) |  |
Expenses |  |  |  |  |  |
Property operating expenses |  | (2,943) |  | (6,673) |  |
Depreciation and amortization associated with real estate operations |  | (1,558) |  | (3,143) |  |
Impairment recoveries |  |  |  | (2,533) |  |
General, administrative and leasing expenses |  | 1,109 |  | 3,661 |  |
Total operating expenses |  | (3,392) |  | (8,688) |  |
Operating income |  | (2,330) |  | (2,910) |  |
Interest expense |  | 508 |  | 997 |  |
Income tax expense |  |  |  | 3,969 |  |
Income from continuing operations |  | (1,822) |  | 2,056 |  |
Discontinued operations |  | 1,822 |  | 1,202 |  |
Net income |  |  |  | 3,258 |  |
Net income attributable to noncontrolling interests in common units in COPLP |  | (32) |  | (246) |  |
Net income attributable to noncontrolling interests in other consolidated entities |  | 583 |  | 1,157 |  |
Net income attributable to Corporate Office Properties Trust |  | 551 |  | 4,169 |  |
Basic and diluted earnings per common share: |  |  |  |  |  |
Income from continuing operations (in dollars per share) |  | $ (0.02) |  | $ 0.04 |  |
Income from discontinued operations (in dollars per share) |  | $ 0.03 |  | $ 0.01 |  |
Net income attributable to COPT common shareholders (in dollars per share) |  | $ 0.01 |  | $ 0.05 |  |
Revisions |  |  |  |  |  |
Redeemable noncontrolling interest |  | 9,578 |  | 9,578 |  |
Additional paid-in capital |  | (3,142) |  | (3,142) |  |
Cumulative distributions in excess of net income |  | 2,416 |  | 2,416 |  |
Noncontrolling interests in common units in COPLP |  | 148 |  | 148 |  |
Noncontrolling interests in other consolidated entities |  | (9,000) |  | (9,000) |  |
Total equity |  | (9,578) |  | (9,578) |  |
Continuing Operations | Reclassifications |  |  |  |  |  |
Expenses |  |  |  |  |  |
Property operating expenses |  | (1,110) |  | (2,951) |  |
General, administrative and leasing expenses |  | 1,110 |  | 2,951 |  |
Continuing Operations | Revisions |  |  |  |  |  |
Expenses |  |  |  |  |  |
General, administrative and leasing expenses |  |  |  | 711 |  |
Total operating expenses |  |  |  | 711 |  |
Operating income |  |  |  | (711) |  |
Income tax expense |  |  |  | 3,969 |  |
Income from continuing operations |  |  |  | 3,258 |  |
Net income |  |  |  | 3,258 |  |
Net income attributable to noncontrolling interests in common units in COPLP |  | (32) |  | (246) |  |
Net income attributable to noncontrolling interests in other consolidated entities |  | 583 |  | 1,157 |  |
Net income attributable to Corporate Office Properties Trust |  | 551 |  | 4,169 |  |
Basic and diluted earnings per common share: |  |  |  |  |  |
Income from continuing operations (in dollars per share) |  | $ 0.01 |  | $ 0.05 |  |
Net income attributable to COPT common shareholders (in dollars per share) |  | $ 0.01 |  | $ 0.05 |  |
Discontinued Operations | Reclassifications |  |  |  |  |  |
Total revenues |  | (5,722) |  | (11,598) |  |
Expenses |  |  |  |  |  |
Property operating expenses |  | (1,833) |  | (3,722) |  |
Depreciation and amortization associated with real estate operations |  | (1,558) |  | (3,143) |  |
Impairment recoveries |  |  |  | (2,533) |  |
General, administrative and leasing expenses |  | (1) |  | (1) |  |
Total operating expenses |  | (3,392) |  | (9,399) |  |
Operating income |  | (2,330) |  | (2,199) |  |
Interest expense |  | 508 |  | 997 |  |
Income from continuing operations |  | (1,822) |  | (1,202) |  |
Discontinued operations |  | $ 1,822 |  | $ 1,202 |  |
Basic and diluted earnings per common share: |  |  |  |  |  |
Income from continuing operations (in dollars per share) |  | $ (0.03) |  | $ (0.01) |  |
Income from discontinued operations (in dollars per share) |  | $ 0.03 |  | $ 0.01 |  |

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