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Quarterly Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2015
Quarterly Data [Line Items] |
Schedule of selected quarterly information | The tables below set forth selected quarterly information for the years ended December 31, 2015 and 2014 (in thousands, except per share data). Certain of the amounts below have been reclassified to conform to the current period presentation of our consolidated financial statements.
| For the Year Ended December 31, 2015 |  | For the Year Ended December 31, 2014
| First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter |  | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
COPT and Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ | 161,034 |  |  | $ | 170,363 |  |  | $ | 150,744 |  |  | $ | 143,325 |  |  | $ | 146,667 |  |  | $ | 139,820 |  |  | $ | 153,015 |  |  | $ | 146,971 |
Operating income | $ | 30,575 |  |  | $ | 37,471 |  |  | $ | 31,993 |  |  | $ | 20,055 |  |  | $ | 25,206 |  |  | $ | 31,836 |  |  | $ | 37,422 |  |  | $ | 37,148 |
Income from continuing operations | $ | 10,987 |  |  | $ | 16,839 |  |  | $ | 94,279 |  |  | $ | (1,430 | ) |  | $ | 5,660 |  |  | $ | 9,248 |  |  | $ | 13,727 |  |  | $ | 5,874 |
Discontinued operations | $ | (238 | ) |  | $ | 394 |  |  | $ | — |  |  | $ | — |  |  | $ | 11 |  |  | $ | (198 | ) |  | $ | 191 |  |  | $ | 22 |
Net income | $ | 14,735 |  |  | $ | 17,232 |  |  | $ | 94,294 |  |  | $ | 62,617 |  |  | $ | 5,671 |  |  | $ | 9,050 |  |  | $ | 24,548 |  |  | $ | 5,937 |
Net income attributable to noncontrolling interests | (1,380 | ) |  | (1,451 | ) |  | (4,494 | ) |  | (3,253 | ) |  | (930 | ) |  | (1,160 | ) |  | (1,828 | ) |  | (1,033 | )
Net income attributable to COPT | 13,355 |  |  | 15,781 |  |  | 89,800 |  |  | 59,364 |  |  | 4,741 |  |  | 7,890 |  |  | 22,720 |  |  | 4,904 |
Preferred share dividends | (3,552 | ) |  | (3,553 | ) |  | (3,552 | ) |  | (3,553 | ) |  | (4,490 | ) |  | (4,344 | ) |  | (3,553 | ) |  | (3,552 | )
Issuance costs associated with redeemed preferred shares | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (1,769 | ) |  | — |  |  | — |
Net income attributable to COPT common shareholders | $ | 9,803 |  |  | $ | 12,228 |  |  | $ | 86,248 |  |  | $ | 55,811 |  |  | $ | 251 |  |  | $ | 1,777 |  |  | $ | 19,167 |  |  | $ | 1,352 |
Basic earnings per common share | $ | 0.10 |  |  | $ | 0.13 |  |  | $ | 0.91 |  |  | $ | 0.59 |  |  | $ | 0.00 |  |  | $ | 0.02 |  |  | $ | 0.22 |  |  | $ | 0.01 |
Diluted earnings per common share | $ | 0.10 |  |  | $ | 0.13 |  |  | $ | 0.91 |  |  | $ | 0.59 |  |  | $ | 0.00 |  |  | $ | 0.02 |  |  | $ | 0.22 |  |  | $ | 0.01 |
Corporate Office Properties, L.P. [Member] |
Quarterly Data [Line Items] |
Schedule of selected quarterly information |
COPLP and Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ | 161,034 |  |  | $ | 170,363 |  |  | $ | 150,744 |  |  | $ | 143,325 |  |  | $ | 146,667 |  |  | $ | 139,820 |  |  | $ | 153,015 |  |  | $ | 146,971 |
Operating income | $ | 30,575 |  |  | $ | 37,471 |  |  | $ | 31,993 |  |  | $ | 20,055 |  |  | $ | 25,206 |  |  | $ | 31,836 |  |  | $ | 37,422 |  |  | $ | 37,148 |
Income from continuing operations | $ | 10,987 |  |  | $ | 16,839 |  |  | $ | 94,279 |  |  | $ | (1,430 | ) |  | $ | 5,660 |  |  | $ | 9,248 |  |  | $ | 13,727 |  |  | $ | 5,874 |
Discontinued operations | $ | (238 | ) |  | $ | 394 |  |  | $ | — |  |  | $ | — |  |  | $ | 11 |  |  | $ | (198 | ) |  | $ | 191 |  |  | $ | 22 |
Net income | $ | 14,735 |  |  | $ | 17,232 |  |  | $ | 94,294 |  |  | $ | 62,617 |  |  | $ | 5,671 |  |  | $ | 9,050 |  |  | $ | 24,548 |  |  | $ | 5,937 |
Net income attributable to noncontrolling interests | (818 | ) |  | (812 | ) |  | (972 | ) |  | (918 | ) |  | (737 | ) |  | (837 | ) |  | (897 | ) |  | (805 | )
Net income attributable to COPLP | 13,917 |  |  | 16,420 |  |  | 93,322 |  |  | 61,699 |  |  | 4,934 |  |  | 8,213 |  |  | 23,651 |  |  | 5,132 |
Preferred unit distributions | (3,717 | ) |  | (3,718 | ) |  | (3,717 | ) |  | (3,718 | ) |  | (4,655 | ) |  | (4,509 | ) |  | (3,718 | ) |  | (3,717 | )
Issuance costs associated with redeemed preferred units | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (1,769 | ) |  | — |  |  | — |
Net income attributable to COPLP common unitholders | $ | 10,200 |  |  | $ | 12,702 |  |  | $ | 89,605 |  |  | $ | 57,981 |  |  | $ | 279 |  |  | $ | 1,935 |  |  | $ | 19,933 |  |  | $ | 1,415 |
Basic earnings per common unit | $ | 0.10 |  |  | $ | 0.13 |  |  | $ | 0.91 |  |  | $ | 0.59 |  |  | $ | 0.00 |  |  | $ | 0.02 |  |  | $ | 0.22 |  |  | $ | 0.01 |
Diluted earnings per common unit | $ | 0.10 |  |  | $ | 0.13 |  |  | $ | 0.91 |  |  | $ | 0.59 |  |  | $ | 0.00 |  |  | $ | 0.02 |  |  | $ | 0.22 |  |  | $ | 0.01 |

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