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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Tables) | 3 Months Ended
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Mar. 31, 2013
Accounting Policies [Abstract] |
Schedule of adjustments to prior period financial statements | The following are selected line items from our financial statements as of, and for the three months ended, March 31, 2012 illustrating the affect of adjustments to revise the financial statements (the “As Previously Reported” columns include the effects of other reclassifications and retrospective changes in presentation discussed in our 2012 Annual Report on Form 10 (in thousands):
| Consolidated Balance Sheet as of March 31, 2012
| Per March 31, 2012 10-Q |  | As Revised |  | Change |  | Reclassifications |  | Revisions
Redeemable noncontrolling interest | $ | — |  |  | $ | 9,237 |  |  | $ | 9,237 |  |  | $ | — |  |  | $ | 9,237 |
Preferred Shares, reported at par value | $ | 81 |  |  | $ | — |  |  | $ | (81 | ) |  | $ | (81 | ) |  | $ | — |
Preferred Shares, reported at liquidation value | $ | — |  |  | $ | 216,333 |  |  | $ | 216,333 |  |  | $ | 216,333 |  |  | $ | — |
Additional paid-in capital | $ | 1,670,451 |  |  | $ | 1,451,981 |  |  | $ | (218,470 | ) |  | $ | (216,252 | ) |  | $ | (2,218 | )
Cumulative distributions in excess of net income | $ | (549,456 | ) |  | $ | (547,591 | ) |  | $ | 1,865 |  |  | $ | — |  |  | $ | 1,865 |
Noncontrolling interests in common units in the Operating Partnership | $ | 53,883 |  |  | $ | 53,999 |  |  | $ | 116 |  |  | $ | — |  |  | $ | 116 |
Noncontrolling interests in other consolidated entities | $ | 18,518 |  |  | $ | 9,518 |  |  | $ | (9,000 | ) |  | $ | — |  |  | $ | (9,000 | )
Total equity | $ | 1,200,796 |  |  | $ | 1,191,559 |  |  | $ | (9,237 | ) |  | $ | — |  |  | $ | (9,237 | )
Total liabilities, redeemable noncontrolling interest and equity | $ | 3,797,368 |  |  | $ | 3,797,368 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
| Consolidated Statements of Operations for the
| Three Months Ended March 31, 2012
| Per March 31, 2012 10-Q |  | Per March 31, 2013 10-Q |  | Change |  | Discontinued Operations |  | Other Reclassifications |  | Revisions
Total revenues | $ | 143,473 |  |  | $ | 132,195 |  |  | $ | (11,278 | ) |  | $ | (11,278 | ) |  | $ | — |  |  | $ | — |
Expenses |  |  |  |  |  |  |  |  |  |  |  |
Property operating expenses | $ | 47,202 |  |  | $ | 41,253 |  |  | $ | (5,949 | ) |  | $ | (4,108 | ) |  | $ | (1,841 | ) |  | $ | — |
Depreciation and amortization associated with real estate operations | 31,066 |  |  | 27,834 |  |  | (3,232 | ) |  | (3,232 | ) |  | — |  |  | — |
Construction contract and other service expenses | 20,607 |  |  | 20,607 |  |  | — |  |  | — |  |  | — |  |  | — |
Impairment losses (recoveries) | 5,126 |  |  | (4,836 | ) |  | (9,962 | ) |  | (9,962 | ) |  | — |  |  | — |
General, administrative and leasing expenses | 7,017 |  |  | 9,569 |  |  | 2,552 |  |  | — |  |  | 1,841 |  |  | 711 |
Business development expenses and land carry costs | 1,594 |  |  | 1,576 |  |  | (18 | ) |  | (18 | ) |  | — |  |  | — |
Total operating expenses | $ | 112,612 |  |  | $ | 96,003 |  |  | $ | (16,609 | ) |  | $ | (17,320 | ) |  | $ | — |  |  | $ | 711 |
Operating income | $ | 30,861 |  |  | $ | 36,192 |  |  | $ | 5,331 |  |  | $ | 6,042 |  |  | $ | — |  |  | $ | (711 | )
Interest expense | $ | (25,224 | ) |  | $ | (24,431 | ) |  | $ | 793 |  |  | $ | 793 |  |  | $ | — |  |  | $ | — |
Income tax (expense) benefit | $ | (4,173 | ) |  | $ | (204 | ) |  | $ | 3,969 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,969 |
Income from continuing operations | $ | 2,592 |  |  | $ | 12,685 |  |  | $ | 10,093 |  |  | $ | 6,835 |  |  | $ | — |  |  | $ | 3,258 |
Discontinued operations | $ | 4,385 |  |  | $ | (2,450 | ) |  | $ | (6,835 | ) |  | $ | (6,835 | ) |  | $ | — |  |  | $ | — |
Net income | $ | 6,977 |  |  | $ | 10,235 |  |  | $ | 3,258 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,258 |
Net income attributable to noncontrolling interests in common units in the Operating Partnership | $ | (159 | ) |  | $ | (373 | ) |  | $ | (214 | ) |  | $ | — |  |  | $ | — |  |  | $ | (214 | )
Net income attributable to noncontrolling interests in other consolidated entities | $ | 24 |  |  | $ | 598 |  |  | $ | 574 |  |  | $ | — |  |  | $ | — |  |  | $ | 574 |
Net income attributable to Corporate Office Properties Trust | $ | 6,677 |  |  | $ | 10,295 |  |  | $ | 3,618 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,618 |
Basic and diluted earnings per common share: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations | $ | (0.02 | ) |  | $ | 0.12 |  |  | $ | 0.14 |  |  | $ | 0.09 |  |  | $ | — |  |  | $ | 0.05 |
Discontinued operations | 0.06 |  |  | (0.03 | ) |  | (0.09 | ) |  | (0.09 | ) |  | — |  |  | — |
Net income attributable to COPT common shareholders | $ | 0.04 |  |  | $ | 0.09 |  |  | $ | 0.05 |  |  | $ | — |  |  | $ | — |  |  | $ | 0.05 |

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- Definition Tabular disclosure of prior period adjustments to previously issued financial statements including (1) the effect of the correction on each financial statement line item and any per-share amounts affected for each prior period presented (2) the cumulative effect of the change on retained earnings or other appropriate components of equity or net assets in the statement of financial position, as of the beginning of the earliest period presented, and (3) the effect of the prior period adjustments (both gross and net of applicable income tax) on the net income of each prior period presented in the entity's annual report for the year in which the adjustments are made. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 154 -Paragraph 26 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 9 -Paragraph 26 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6801783&loc=d3e22644-107794 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6801783&loc=d3e22663-107794 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6801783&loc=d3e22658-107794 + Details
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