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Summary of Significant Accounting Policies 2 (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2011
Redeemable noncontrolling interest | $ 16,789 | $ 9,932 | $ 16,789 | $ 9,932 | $ 10,298 |
Additional paid-in capital | 1,812,801 | 1,451,416 | 1,812,801 | 1,451,416 | 1,653,672 |
Cumulative distributions in excess of net income | (700,368) | (607,633) | (700,368) | (607,633) | (617,455) |
Noncontrolling interests in common units in COPLP | 50,815 | 49,157 | 50,815 | 49,157 | 52,122 |
Noncontrolling interests in other consolidated entities | 9,137 | 9,682 | 9,137 | 9,682 | 10,153 |
Total equity | 1,434,067 | 1,240,289 | 1,434,067 | 1,240,289 | 1,436,499 | 1,205,899
Total liabilities, redeemable noncontrolling interest and equity | 3,755,588 | 3,597,656 | 3,755,588 | 3,597,656 | 3,653,759 |
Total revenues | 136,031 | 129,645 | 407,175 | 389,043 |  |
Expenses |  |  |  |  |  |
Property operating expenses | 43,482 | 41,474 | 129,409 | 122,102 |  |
Depreciation and amortization associated with real estate operations | 29,210 | 28,604 | 86,239 | 84,633 |  |
Construction contract and other service expenses | 16,306 | 14,410 | 49,165 | 51,302 |  |
Impairment losses | 16,300 | 46,096 | 16,300 | 41,260 |  |
General, administrative and leasing expenses |  | 6,377 |  | 24,797 |  |
Business development expenses and land carry costs | 1,383 | 1,632 | 4,069 | 4,506 |  |
Total operating expenses | 114,708 | 138,593 | 307,612 | 328,600 |  |
Operating income (loss) | 21,323 | (8,948) | 99,563 | 60,443 |  |
Interest expense | (21,242) | (23,239) | (66,851) | (71,909) |  |
Income tax expense | (24) | (106) | (61) | (327) |  |
Loss from continuing operations | (276) | (32,212) | 8,783 | (10,100) |  |
Discontinued operations | (1,724) | 11,447 | (2,594) | 11,410 |  |
Net (loss) income | (2,000) | (20,765) | 8,872 | 1,331 |  |
Net loss attributable to noncontrolling interests in common units in COPLP | 232 | 1,533 | 474 | 738 |  |
Net loss attributable to noncontrolling interests in other consolidated entities | (1,031) | 235 | (2,160) | 864 |  |
Net loss attributable to COPT | (2,964) | (19,162) | 6,691 | 2,438 |  |
Basic and diluted earnings per common share: |  |  |  |  |  |
Income from continuing operations (in dollars per share) |  | $ (0.54) |  | $ (0.35) |  |
Income from discontinued operations (in dollars per share) |  | $ 0.15 |  | $ 0.15 |  |
Net income attributable to COPT common shareholders (in dollars per share) |  | $ (0.39) |  | $ (0.20) |  |
Scenario, Previously Reported |  |  |  |  |  |
Redeemable noncontrolling interest |  | 0 |  | 0 |  |
Additional paid-in capital |  | 1,455,558 |  | 1,455,558 |  |
Cumulative distributions in excess of net income |  | (610,659) |  | (610,659) |  |
Noncontrolling interests in common units in COPLP |  | 48,973 |  | 48,973 |  |
Noncontrolling interests in other consolidated entities |  | 18,682 |  | 18,682 |  |
Total equity |  | 1,250,221 |  | 1,250,221 |  |
Total liabilities, redeemable noncontrolling interest and equity |  | 3,597,656 |  | 3,597,656 |  |
Total revenues |  | 130,144 |  | 390,499 |  |
Expenses |  |  |  |  |  |
Property operating expenses |  | 42,799 |  | 126,339 |  |
Depreciation and amortization associated with real estate operations |  | 28,698 |  | 84,920 |  |
Construction contract and other service expenses |  | 14,410 |  | 51,302 |  |
Impairment losses |  | 46,096 |  | 41,260 |  |
General, administrative and leasing expenses |  | 5,061 |  | 19,820 |  |
Business development expenses and land carry costs |  | 1,632 |  | 4,506 |  |
Total operating expenses |  | 138,696 |  | 328,147 |  |
Operating income (loss) |  | (8,552) |  | 62,352 |  |
Interest expense |  | (23,239) |  | (71,909) |  |
Income tax expense |  | (106) |  | (4,296) |  |
Loss from continuing operations |  | (31,816) |  | (12,160) |  |
Discontinued operations |  | 11,051 |  | 10,212 |  |
Net (loss) income |  | (20,765) |  | (1,927) |  |
Net loss attributable to noncontrolling interests in common units in COPLP |  | 1,569 |  | 1,020 |  |
Net loss attributable to noncontrolling interests in other consolidated entities |  | (411) |  | (939) |  |
Net loss attributable to COPT |  | (19,772) |  | (2,341) |  |
Basic and diluted earnings per common share: |  |  |  |  |  |
Income from continuing operations (in dollars per share) |  | $ (0.54) |  | $ (0.40) |  |
Income from discontinued operations (in dollars per share) |  | $ 0.15 |  | $ 0.13 |  |
Net income attributable to COPT common shareholders (in dollars per share) |  | $ (0.39) |  | $ (0.27) |  |
Change |  |  |  |  |  |
Redeemable noncontrolling interest |  | 9,932 |  | 9,932 |  |
Additional paid-in capital |  | (4,142) |  | (4,142) |  |
Cumulative distributions in excess of net income |  | 3,026 |  | 3,026 |  |
Noncontrolling interests in common units in COPLP |  | 184 |  | 184 |  |
Noncontrolling interests in other consolidated entities |  | (9,000) |  | (9,000) |  |
Total equity |  | (9,932) |  | (9,932) |  |
Total revenues |  | (499) |  | (1,456) |  |
Expenses |  |  |  |  |  |
Property operating expenses |  | (1,325) |  | (4,237) |  |
Depreciation and amortization associated with real estate operations |  | (94) |  | (287) |  |
General, administrative and leasing expenses |  | 1,316 |  | 4,977 |  |
Total operating expenses |  | (103) |  | 453 |  |
Operating income (loss) |  | (396) |  | (1,909) |  |
Income tax expense |  |  |  | 3,969 |  |
Loss from continuing operations |  | (396) |  | 2,060 |  |
Discontinued operations |  | 396 |  | 1,198 |  |
Net (loss) income |  |  |  | 3,258 |  |
Net loss attributable to noncontrolling interests in common units in COPLP |  | (36) |  | (282) |  |
Net loss attributable to noncontrolling interests in other consolidated entities |  | 646 |  | 1,803 |  |
Net loss attributable to COPT |  | 610 |  | 4,779 |  |
Basic and diluted earnings per common share: |  |  |  |  |  |
Income from continuing operations (in dollars per share) |  |  |  | $ 0.05 |  |
Income from discontinued operations (in dollars per share) |  |  |  | $ 0.02 |  |
Net income attributable to COPT common shareholders (in dollars per share) |  |  |  | $ 0.07 |  |
Revisions |  |  |  |  |  |
Redeemable noncontrolling interest |  | 9,932 |  | 9,932 |  |
Additional paid-in capital |  | (4,142) |  | (4,142) |  |
Cumulative distributions in excess of net income |  | 3,026 |  | 3,026 |  |
Noncontrolling interests in common units in COPLP |  | 184 |  | 184 |  |
Noncontrolling interests in other consolidated entities |  | (9,000) |  | (9,000) |  |
Total equity |  | (9,932) |  | (9,932) |  |
Continuing Operations | Reclassifications |  |  |  |  |  |
Expenses |  |  |  |  |  |
Property operating expenses |  | (1,316) |  | (4,269) |  |
General, administrative and leasing expenses |  | 1,316 |  | 4,269 |  |
Continuing Operations | Revisions |  |  |  |  |  |
Expenses |  |  |  |  |  |
General, administrative and leasing expenses |  |  |  | 711 |  |
Total operating expenses |  |  |  | 711 |  |
Operating income (loss) |  |  |  | (711) |  |
Income tax expense |  |  |  | 3,969 |  |
Loss from continuing operations |  |  |  | 3,258 |  |
Net (loss) income |  |  |  | 3,258 |  |
Net loss attributable to noncontrolling interests in common units in COPLP |  | (36) |  | (282) |  |
Net loss attributable to noncontrolling interests in other consolidated entities |  | 646 |  | 1,803 |  |
Net loss attributable to COPT |  | 610 |  | 4,779 |  |
Basic and diluted earnings per common share: |  |  |  |  |  |
Income from continuing operations (in dollars per share) |  |  |  | $ 0.07 |  |
Net income attributable to COPT common shareholders (in dollars per share) |  |  |  | $ 0.07 |  |
Discontinued Operations | Reclassifications |  |  |  |  |  |
Total revenues |  | (499) |  | (1,456) |  |
Expenses |  |  |  |  |  |
Property operating expenses |  | (9) |  | 32 |  |
Depreciation and amortization associated with real estate operations |  | (94) |  | (287) |  |
General, administrative and leasing expenses |  |  |  | (3) |  |
Total operating expenses |  | (103) |  | (258) |  |
Operating income (loss) |  | (396) |  | (1,198) |  |
Loss from continuing operations |  | (396) |  | (1,198) |  |
Discontinued operations |  | $ 396 |  | $ 1,198 |  |
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) |  |  |  | $ 0.02 |  |

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