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v3.8.0.1

Quarterly Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Quarterly Data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 164,567 | $ 157,017 | $ 151,435 | $ 139,801 | $ 141,991 | $ 142,103 | $ 145,927 | $ 144,307 | $ 612,820 |  | $ 574,328 |  | $ 625,466 |
Operating income | 24,847 | 38,939 | 36,618 | 35,433 | 37,442 | 11,525 | (27,021) | 30,464 | 135,837 |  | 52,410 |  | 120,094 |
Income (loss) from continuing operations | 6,904 | 21,494 | 19,195 | 18,850 | 19,718 | (4,829) | (48,316) | 8,096 | 66,443 |  | (25,331) |  | 120,675 |
Net income (loss) | 11,356 | 22,682 | 19,207 | 23,088 | 26,603 | 29,272 | (48,316) | 8,096 | 76,333 |  | 15,655 |  | 188,878 |
Net (income) loss attributable to noncontrolling interests | (1,398) | (1,766) | (1,345) | (1,733) | (1,870) | (1,973) | 897 | (1,270) |  |  |  |  |  |
Net income attributable to COPT | 9,958 | 20,916 | 17,862 | 21,355 | 24,733 | 27,299 | (47,419) | 6,826 | 70,091 |  | 11,439 |  | 178,300 |
Preferred share/ unit dividends/ distributions | 0 | 0 | (3,039) | (3,180) | (3,640) | (3,552) | (3,553) | (3,552) | (6,219) |  | (14,297) |  | (14,210) |
Issuance costs associated with redeemed preferred shares | 0 | 0 | (6,847) | 0 | (17) | 0 | 0 | 0 | (6,847) |  | (17) |  | 0 |
Net income (loss) attributable to COPT common shareholders | $ 9,958 | $ 20,916 | $ 7,976 | $ 18,175 | $ 21,076 | $ 23,747 | $ (50,972) | $ 3,274 | $ 57,025 |  | $ (2,875) |  | $ 164,090 |
Basic earnings per common share/unit (in dollars per share/unit) | $ 0.10 | $ 0.21 | $ 0.08 | $ 0.18 | $ 0.22 | $ 0.25 | $ (0.54) | $ 0.03 | $ 0.57 | [1] | $ (0.03) | [1] | $ 1.74 | [1]
Diluted earnings per common share/unit (in dollars per share/unit) | $ 0.10 | $ 0.21 | $ 0.08 | $ 0.18 | $ 0.22 | $ 0.25 | $ (0.54) | $ 0.03 | $ 0.57 | [1] | $ (0.03) | [1] | $ 1.74 | [1]
Corporate Office Properties, L.P. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 164,567 | $ 157,017 | $ 151,435 | $ 139,801 | $ 141,991 | $ 142,103 | $ 145,927 | $ 144,307 | $ 612,820 |  | $ 574,328 |  | $ 625,466 |
Operating income | 24,847 | 38,939 | 36,618 | 35,433 | 37,442 | 11,525 | (27,021) | 30,464 | 135,837 |  | 52,410 |  | 120,094 |
Income (loss) from continuing operations | 6,904 | 21,494 | 19,195 | 18,850 | 19,718 | (4,829) | (48,316) | 8,096 | 66,443 |  | (25,331) |  | 120,675 |
Net income (loss) | 11,356 | 22,682 | 19,207 | 23,088 | 26,603 | 29,272 | (48,316) | 8,096 | 76,333 |  | 15,655 |  | 188,878 |
Net (income) loss attributable to noncontrolling interests | (908) | (897) | (907) | (934) | (912) | (913) | (911) | (979) | (3,646) |  | (3,715) |  | (3,520) |
Net income attributable to COPT | 10,448 | 21,785 | 18,300 | 22,154 | 25,691 | 28,359 | (49,227) | 7,117 | 72,687 |  | 11,940 |  | 185,358 |
Preferred share/ unit dividends/ distributions | (165) | (165) | (3,204) | (3,345) | (3,805) | (3,717) | (3,718) | (3,717) | (6,879) |  | (14,957) |  | (14,870) |
Issuance costs associated with redeemed preferred shares | 0 | 0 | (6,847) | 0 | (17) | 0 | 0 | 0 | (6,847) |  | (17) |  | 0 |
Net income (loss) attributable to COPT common shareholders | $ 10,283 | $ 21,620 | $ 8,249 | $ 18,809 | $ 21,869 | $ 24,642 | $ (52,945) | $ 3,400 | $ 58,961 |  | $ (3,034) |  | $ 170,488 |
Basic earnings per common share/unit (in dollars per share/unit) | $ 0.10 | $ 0.21 | $ 0.08 | $ 0.18 | $ 0.22 | $ 0.25 | $ (0.54) | $ 0.03 | $ 0.57 | [2] | $ (0.04) | [2] | $ 1.74 | [2]
Diluted earnings per common share/unit (in dollars per share/unit) | $ 0.10 | $ 0.21 | $ 0.08 | $ 0.18 | $ 0.22 | $ 0.25 | $ (0.54) | $ 0.03 | $ 0.57 | [2] | $ (0.04) | [2] | $ 1.74 | [2]
[1] | Basic and diluted earnings per common share are calculated based on amounts attributable to common shareholders of Corporate Office Properties Trust.
[2] | Basic and diluted earnings per common unit are calculated based on amounts attributable to common unitholders of Corporate Office Properties, L.P.

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