Annual report pursuant to Section 13 and 15(d)

Quarterly Data (Unaudited) (Details)

v3.10.0.1
Quarterly Data (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Quarterly Data [Line Items]                      
Total revenues $ 138,482 $ 137,411 $ 146,743 $ 155,476 $ 164,567 $ 157,017 $ 151,435 $ 139,801 $ 578,112 $ 612,820 $ 574,328
Net income 18,456 20,322 21,085 18,780 11,008 22,334 18,859 22,740 78,643 74,941 33,768
Net income attributable to noncontrolling interests (1,436) (1,625) (1,651) (1,630) (1,387) (1,755) (1,333) (1,721)      
Net income attributable to COPT 17,020 18,697 19,434 17,150 9,621 20,579 17,526 21,019 72,301 68,745 28,890
Preferred share/ unit dividends/ distributions 0 0 0 0 0 0 (3,039) (3,180) 0 (6,219) (14,297)
Issuance costs associated with redeemed preferred shares 0 0 0 0 0 0 (6,847) 0 0 (6,847) (17)
Net income attributable to COPT common shareholders $ 17,020 $ 18,697 $ 19,434 $ 17,150 $ 9,621 $ 20,579 $ 7,640 $ 17,839 $ 72,301 $ 55,679 $ 14,576
Basic earnings per common share/unit (in dollars per share/unit) $ 0.16 $ 0.18 $ 0.19 $ 0.17 $ 0.10 $ 0.21 $ 0.08 $ 0.18 $ 0.69 $ 0.56 $ 0.15
Diluted earnings per common share/unit (in dollars per share/unit) $ 0.16 $ 0.18 $ 0.19 $ 0.17 $ 0.10 $ 0.21 $ 0.08 $ 0.18 $ 0.69 $ 0.56 $ 0.15
Corporate Office Properties, L.P. [Member]                      
Quarterly Data [Line Items]                      
Total revenues $ 138,482 $ 137,411 $ 146,743 $ 155,476 $ 164,567 $ 157,017 $ 151,435 $ 139,801 $ 578,112 $ 612,820 $ 574,328
Net income 18,456 20,322 21,085 18,780 11,008 22,334 18,859 22,740 78,643 74,941 33,768
Net income attributable to noncontrolling interests (1,061) (1,080) (878) (921) (908) (897) (907) (934) (3,940) (3,646) (3,715)
Net income attributable to COPT 17,395 19,242 20,207 17,859 10,100 21,437 17,952 21,806 74,703 71,295 30,053
Preferred share/ unit dividends/ distributions (165) (165) (165) (165) (165) (165) (3,204) (3,345) (660) (6,879) (14,957)
Issuance costs associated with redeemed preferred shares 0 0 0 0 0 0 (6,847) 0 0 (6,847) (17)
Net income attributable to COPT common shareholders $ 17,230 $ 19,077 $ 20,042 $ 17,694 $ 9,935 $ 21,272 $ 7,901 $ 18,461 $ 74,043 $ 57,569 $ 15,079
Basic earnings per common share/unit (in dollars per share/unit) $ 0.16 $ 0.18 $ 0.19 $ 0.17 $ 0.10 $ 0.21 $ 0.08 $ 0.18 $ 0.69 [1] $ 0.56 [1] $ 0.15 [1]
Diluted earnings per common share/unit (in dollars per share/unit) $ 0.16 $ 0.18 $ 0.19 $ 0.17 $ 0.10 $ 0.21 $ 0.08 $ 0.18 $ 0.69 [1] $ 0.56 [1] $ 0.15 [1]
[1] Basic and diluted earnings per common unit are calculated based on amounts attributable to common unitholders of Corporate Office Properties, L.P.