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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, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Revenues | $ 128,802 | $ 131,812 | $ 136,527 | $ 126,219 | $ 132,635 | $ 125,067 | $ 123,074 | $ 127,359 | $ 523,360 |  | $ 508,135 |  | $ 492,956 |
Operating income (loss) | 34,843 | 30,673 | 40,229 | 36,165 | 33,190 | (10,844) | 32,069 | 34,651 | 141,910 |  | 89,066 |  | 30,298 |
Income (loss) from continuing operations | 14,432 | 10,974 | (232) | 11,662 | 16,495 | (32,048) | 10,336 | 13,184 | 36,836 |  | 7,967 |  | (79,201) |
Discontinued operations | 71,907 | (12,974) | (4,502) | 1,261 | 2,515 | 11,283 | 1,504 | (2,949) | 55,692 |  | 12,353 |  | (51,107) |
Net income (loss) | 92,672 | (2,000) | (4,405) | 15,277 | 19,010 | (20,765) | 11,861 | 10,235 | 101,544 |  | 20,341 |  | (127,576) |
Net (income) loss attributable to noncontrolling interests in consolidated entities | (5,656) | (964) | (960) | (257) | (471) | 1,603 | (556) | 60 |  |  |  |  |  |
Net income (loss) attributable to COPT | 87,016 | (2,964) | (5,365) | 15,020 | 18,539 | (19,162) | 11,305 | 10,295 | 93,707 |  | 20,977 |  | (119,428) |
Preferred share dividends | (4,490) | (4,490) | (4,885) | (6,106) | (6,106) | (6,546) | (4,167) | (4,025) | (19,971) |  | (20,844) |  | (16,102) |
Issuance costs associated with redeemed preferred shares | 0 | 0 | (2,904) | 0 | 0 | (1,827) | 0 | 0 | (2,904) |  | (1,827) |  | 0 |
Net income (loss) attributable to COPT common shareholders | 82,526 | (7,454) | (13,154) | 8,914 | 12,433 | (27,535) | 7,138 | 6,270 | 70,832 |  | (1,694) |  | (135,530) |
Basic earnings per common share/unit (in dollars per share/unit) | $ 0.94 | $ (0.09) | $ (0.16) | $ 0.11 | $ 0.16 | $ (0.39) | $ 0.10 | $ 0.09 | $ 0.83 | [1] | $ (0.03) | [1] | $ (1.97) | [1]
Diluted earnings per common share/unit (in dollars per share/unit) | $ 0.94 | $ (0.09) | $ (0.16) | $ 0.11 | $ 0.16 | $ (0.39) | $ 0.10 | $ 0.09 | $ 0.83 | [1] | $ (0.03) | [1] | $ (1.97) | [1]
Corporate Office Properties, L.P. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | 128,802 | 131,812 | 136,527 | 126,219 | 132,635 | 125,067 | 123,074 | 127,359 | 523,360 |  | 508,135 |  | 492,956 |
Operating income (loss) | 34,843 | 30,673 | 40,229 | 36,165 | 33,190 | (10,844) | 32,069 | 34,651 | 141,910 |  | 89,066 |  | 30,304 |
Income (loss) from continuing operations | 14,432 | 10,974 | (232) | 11,662 | 16,495 | (32,048) | 10,336 | 13,184 | 36,836 |  | 7,967 |  | (79,195) |
Discontinued operations | 71,907 | (12,974) | (4,502) | 1,261 | 2,515 | 11,283 | 1,504 | (2,949) | 55,692 |  | 12,353 |  | (51,107) |
Net income (loss) | 92,672 | (2,000) | (4,405) | 15,277 | 19,010 | (20,765) | 11,861 | 10,235 | 101,544 |  | 20,341 |  | (127,570) |
Net (income) loss attributable to noncontrolling interests in consolidated entities | (1,735) | (1,035) | (1,473) | 336 | 340 | (404) | 1 | 570 | (3,907) |  | 507 |  | 244 |
Net income (loss) attributable to COPT | 90,937 | (3,035) | (5,878) | 15,613 | 19,350 | (21,169) | 11,862 | 10,805 | 97,637 |  | 20,848 |  | (127,326) |
Preferred share dividends | (4,655) | (4,655) | (5,050) | (6,271) | (6,271) | (6,711) | (4,332) | (4,190) | (20,631) |  | (21,504) |  | (16,762) |
Issuance costs associated with redeemed preferred shares | 0 | 0 | (2,904) | 0 | 0 | (1,827) | 0 | 0 | (2,904) |  | (1,827) |  | 0 |
Net income (loss) attributable to COPT common shareholders | $ 86,282 | $ (7,690) | $ (13,832) | $ 9,342 | $ 13,079 | $ (29,707) | $ 7,530 | $ 6,615 | $ 74,102 |  | $ (2,483) |  | $ (144,088) |
Basic earnings per common share/unit (in dollars per share/unit) | $ 0.94 | $ (0.09) | $ (0.16) | $ 0.11 | $ 0.16 | $ (0.39) | $ 0.10 | $ 0.09 | $ 0.83 | [1] | $ (0.04) | [1] | $ (2.00) | [1]
Diluted earnings per common share/unit (in dollars per share/unit) | $ 0.94 | $ (0.09) | $ (0.16) | $ 0.11 | $ 0.16 | $ (0.39) | $ 0.10 | $ 0.09 | $ 0.83 | [1] | $ (0.04) | [1] | $ (2.00) | [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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