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Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Revenues |  |  |  |  |  |
Rental revenue | $ 384,774 |  | $ 353,229 |  | $ 328,409 |
Tenant recoveries and other real estate operations revenue | 87,722 |  | 79,694 |  | 66,132 |
Construction contract and other service revenues | 84,345 |  | 104,675 |  | 343,087 |
Total revenues | 556,841 |  | 537,598 |  | 737,628 |
Expenses |  |  |  |  |  |
Property operating expenses | 186,833 |  | 169,325 |  | 145,973 |
Depreciation and amortization associated with real estate operations | 127,444 |  | 113,234 |  | 97,869 |
Construction contract and other service expenses | 81,639 |  | 102,302 |  | 336,519 |
Impairment losses | 127,765 |  |  |  |  |
General and administrative expenses | 25,843 |  | 24,008 |  | 23,240 |
Business development expenses | 3,195 |  | 4,197 |  | 3,699 |
Total operating expenses | 552,719 |  | 413,066 |  | 607,300 |
Operating income | 4,122 |  | 124,532 |  | 130,328 |
Interest expense | (101,281) |  | (98,748) |  | (79,789) |
Interest and other income | 5,603 |  | 9,568 |  | 5,164 |
Loss on interest rate derivatives | (29,805) |  |  |  |  |
Loss on early extinguishment of debt | (1,683) |  |  |  |  |
(Loss) income from continuing operations before equity in (loss) income of unconsolidated entities and income taxes | (123,044) |  | 35,352 |  | 55,703 |
Equity in (loss) income of unconsolidated entities | (331) |  | 1,376 |  | (941) |
Income tax benefit (expense) | 10,679 |  | (108) |  | (196) |
(Loss) income from continuing operations | (112,696) |  | 36,620 |  | 54,566 |
Discontinued operations | (14,343) |  | 6,055 |  | 6,733 |
(Loss) income before gain on sales of real estate | (127,039) |  | 42,675 |  | 61,299 |
Gain on sales of real estate, net of income taxes | 2,721 |  | 2,829 |  |  |
Net (loss) income | (124,318) |  | 45,504 |  | 61,299 |
Less net loss (income) attributable to noncontrolling interests: |  |  |  |  |  |
Common units in the Operating Partnership | 8,341 |  | (2,116) |  | (4,495) |
Preferred units in the Operating Partnership | (660) |  | (660) |  | (660) |
Other consolidated entities | (1,038) |  | 32 |  | 185 |
Net (loss) income attributable to Corporate Office Properties Trust | (117,675) |  | 42,760 |  | 56,329 |
Preferred share dividends | (16,102) |  | (16,102) |  | (16,102) |
Net (loss) income attributable to Corporate Office Properties Trust common shareholders | (133,777) |  | 26,658 |  | 40,227 |
Net (loss) income attributable to Corporate Office Properties Trust: |  |  |  |  |  |
(Loss) income from continuing operations | (104,272) |  | 37,149 |  | 50,244 |
Discontinued operations, net | (13,403) |  | 5,611 |  | 6,085 |
Net (loss) income attributable to Corporate Office Properties Trust | $ (117,675) |  | $ 42,760 |  | $ 56,329 |
Basic earnings per common share |  |  |  |  |  |
(Loss) income from continuing operations (in dollars per share) | $ (1.75) | [1] | $ 0.34 | [1] | $ 0.59 | [1]
Discontinued operations (in dollars per share) | $ (0.19) | [1] | $ 0.09 | [1] | $ 0.11 | [1]
Net (loss) income attributable to COPT common shareholders (in dollars per share) | $ (1.94) | [1] | $ 0.43 | [1] | $ 0.70 | [1]
Diluted earnings per common share |  |  |  |  |  |
(Loss) income from continuing operations (in dollars per share) | $ (1.75) | [1] | $ 0.34 | [1] | $ 0.59 | [1]
Discontinued operations (in dollars per share) | $ (0.19) | [1] | $ 0.09 | [1] | $ 0.11 | [1]
Net (loss) income attributable to COPT common shareholders (in dollars per share) | $ (1.94) | [1] | $ 0.43 | [1] | $ 0.70 | [1]
[1] | Basic and diluted earnings per common share are calculated based on amounts attributable to common shareholders of Corporate Office Properties Trust.

X
- Definition Business development involves the development of products and services, their delivery, design and their implementation. Business development includes a number of techniques designed to grow an economic enterprise. It includes the non capitalized cost of evaluating and executing acquisitions. + References No definition available. + Details
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- Definition The aggregate revenue from building and real estate development, which may include improvements (such as drainage, utilities, grading and subdividing) to a parcel of land, and general contracting services and revenues from the sale of other goods or rendering of other services, not elsewhere specified in the taxonomy; net of (reduced by) sales adjustments, returns, allowances, and discounts during the reporting period. + References No definition available. + Details
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- Definition The current period expense charged against earnings on long-lived, physical real estate operations assets, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset or deferred costs associated with real estate operations over the benefit period of such asset or costs; or to reflect consumption during the period of an asset that is not used in production. + References No definition available. + Details
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