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Quarterly Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2018
Quarterly Data [Line Items] |
Schedule of selected quarterly information | The tables below set forth selected quarterly information for the years ended December 31, 2018 and 2017 (in thousands, except per share/unit data).
| For the Year Ended December 31, 2018 |  | For the Year Ended December 31, 2017
| First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter |  | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
COPT and Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ | 155,476 |  |  | $ | 146,743 |  |  | $ | 137,411 |  |  | $ | 138,482 |  |  | $ | 139,801 |  |  | $ | 151,435 |  |  | $ | 157,017 |  |  | $ | 164,567 |
Net income | $ | 18,780 |  |  | $ | 21,085 |  |  | $ | 20,322 |  |  | $ | 18,456 |  |  | $ | 22,740 |  |  | $ | 18,859 |  |  | $ | 22,334 |  |  | $ | 11,008 |
Net income attributable to noncontrolling interests | (1,630 | ) |  | (1,651 | ) |  | (1,625 | ) |  | (1,436 | ) |  | (1,721 | ) |  | (1,333 | ) |  | (1,755 | ) |  | (1,387 | )
Net income attributable to COPT | 17,150 |  |  | 19,434 |  |  | 18,697 |  |  | 17,020 |  |  | 21,019 |  |  | 17,526 |  |  | 20,579 |  |  | 9,621 |
Preferred share dividends | — |  |  | — |  |  | — |  |  | — |  |  | (3,180 | ) |  | (3,039 | ) |  | — |  |  | — |
Issuance costs associated with redeemed preferred shares | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (6,847 | ) |  | — |  |  | — |
Net income attributable to COPT common shareholders | $ | 17,150 |  |  | $ | 19,434 |  |  | $ | 18,697 |  |  | $ | 17,020 |  |  | $ | 17,839 |  |  | $ | 7,640 |  |  | $ | 20,579 |  |  | $ | 9,621 |
Basic EPS | $ | 0.17 |  |  | $ | 0.19 |  |  | $ | 0.18 |  |  | $ | 0.16 |  |  | $ | 0.18 |  |  | $ | 0.08 |  |  | $ | 0.21 |  |  | $ | 0.10 |
Diluted EPS | $ | 0.17 |  |  | $ | 0.19 |  |  | $ | 0.18 |  |  | $ | 0.16 |  |  | $ | 0.18 |  |  | $ | 0.08 |  |  | $ | 0.21 |  |  | $ | 0.10 |
Corporate Office Properties, L.P. [Member] |
Quarterly Data [Line Items] |
Schedule of selected quarterly information |
COPLP and Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ | 155,476 |  |  | $ | 146,743 |  |  | $ | 137,411 |  |  | $ | 138,482 |  |  | $ | 139,801 |  |  | $ | 151,435 |  |  | $ | 157,017 |  |  | $ | 164,567 |
Net income | $ | 18,780 |  |  | $ | 21,085 |  |  | $ | 20,322 |  |  | $ | 18,456 |  |  | $ | 22,740 |  |  | $ | 18,859 |  |  | $ | 22,334 |  |  | $ | 11,008 |
Net income attributable to noncontrolling interests | (921 | ) |  | (878 | ) |  | (1,080 | ) |  | (1,061 | ) |  | (934 | ) |  | (907 | ) |  | (897 | ) |  | (908 | )
Net income attributable to COPLP | 17,859 |  |  | 20,207 |  |  | 19,242 |  |  | 17,395 |  |  | 21,806 |  |  | 17,952 |  |  | 21,437 |  |  | 10,100 |
Preferred unit distributions | (165 | ) |  | (165 | ) |  | (165 | ) |  | (165 | ) |  | (3,345 | ) |  | (3,204 | ) |  | (165 | ) |  | (165 | )
Issuance costs associated with redeemed preferred units | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (6,847 | ) |  | — |  |  | — |
Net income attributable to COPLP common unitholders | $ | 17,694 |  |  | $ | 20,042 |  |  | $ | 19,077 |  |  | $ | 17,230 |  |  | $ | 18,461 |  |  | $ | 7,901 |  |  | $ | 21,272 |  |  | $ | 9,935 |
Basic EPU | $ | 0.17 |  |  | $ | 0.19 |  |  | $ | 0.18 |  |  | $ | 0.16 |  |  | $ | 0.18 |  |  | $ | 0.08 |  |  | $ | 0.21 |  |  | $ | 0.10 |
Diluted EPU | $ | 0.17 |  |  | $ | 0.19 |  |  | $ | 0.18 |  |  | $ | 0.16 |  |  | $ | 0.18 |  |  | $ | 0.08 |  |  | $ | 0.21 |  |  | $ | 0.10 |

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109225645&loc=d3e1280-108306 + Details
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