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Quarterly Data (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Quarterly Data (Unaudited) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 139,002 | $ 137,517 | $ 142,833 | $ 137,489 | $ 144,195 | $ 121,915 | $ 129,163 | $ 142,325 | $ 556,841 |  | $ 537,598 |  | $ 737,628 |
Operating income (loss) | (43,482) | 30,761 | 12,836 | 4,007 | 32,834 | 29,233 | 32,718 | 29,747 | 4,122 |  | 124,532 |  | 130,328 |
(Loss) income from continuing operations | (91,089) | 4,283 | (5,524) | (20,366) | 15,311 | 4,528 | 7,891 | 8,890 | (112,696) |  | 36,620 |  | 54,566 |
Discontinued operations | 3,870 | 3,187 | (20,499) | (901) | 1,441 | 1,921 | 925 | 1,768 | (14,343) |  | 6,055 |  | 6,733 |
Net (loss) income | (87,215) | 7,470 | (26,007) | (18,566) | 16,752 | 8,926 | 9,151 | 10,675 | (124,318) |  | 45,504 |  | 61,299 |
Net loss (income) attributable to noncontrolling interests | 4,988 | (904) | 1,783 | 776 | (1,228) | (94) | (685) | (737) | 6,643 |  | (2,744) |  | (4,970) |
Net (loss) income attributable to Corporate Office Properties Trust | (82,227) | 6,566 | (24,224) | (17,790) | 15,524 | 8,832 | 8,466 | 9,938 | (117,675) |  | 42,760 |  | 56,329 |
Preferred share dividends | (4,026) | (4,025) | (4,026) | (4,025) | (4,026) | (4,025) | (4,026) | (4,025) | (16,102) |  | (16,102) |  | (16,102) |
Net (loss) income attributable to Corporate Office Properties Trust common shareholders | $ (86,253) | $ 2,541 | $ (28,250) | $ (21,815) | $ 11,498 | $ 4,807 | $ 4,440 | $ 5,913 | $ (133,777) |  | $ 26,658 |  | $ 40,227 |
Basic earnings per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |
(Loss) income from continuing operations (in dollars per share) | $ (1.26) | $ (0.01) | $ (0.14) | $ (0.32) | $ 0.16 | $ 0.05 | $ 0.06 | $ 0.07 | $ (1.75) | [1] | $ 0.34 | [1] | $ 0.59 | [1]
Net (loss) income attributable to COPT common shareholders (in dollars per share) | $ (1.21) | $ 0.03 | $ (0.42) | $ (0.33) | $ 0.18 | $ 0.08 | $ 0.07 | $ 0.10 | $ (1.94) | [1] | $ 0.43 | [1] | $ 0.70 | [1]
Diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |
(Loss) income from continuing operations (in dollars per share) | $ (1.26) | $ (0.01) | $ (0.14) | $ (0.32) | $ 0.16 | $ 0.05 | $ 0.06 | $ 0.07 | $ (1.75) | [1] | $ 0.34 | [1] | $ 0.59 | [1]
Net (loss) income attributable to COPT common shareholders (in dollars per share) | $ (1.21) | $ 0.03 | $ (0.42) | $ (0.33) | $ 0.18 | $ 0.08 | $ 0.07 | $ 0.10 | $ (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.

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