Annual report pursuant to Section 13 and 15(d)

Quarterly Data (Unaudited) (Details)

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Quarterly Data (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Quarterly Data [Line Items]                      
Total revenues $ 157,785 $ 159,431 $ 175,070 $ 148,940 $ 138,482 $ 137,411 $ 146,743 $ 155,476 $ 641,226 $ 578,112 $ 612,820
Net income 44,877 23,246 109,563 22,318 18,456 20,322 21,085 18,780 200,004 78,643 74,941
Net income attributable to noncontrolling interests (2,092) (1,989) (2,772) (1,459) (1,436) (1,625) (1,651) (1,630)      
Net income attributable to COPT/COPLP                 191,692 72,301 68,745
Preferred unit distributions                 0 0 (6,219)
Net income attributable to COPT/COPLP common shareholders $ 42,785 $ 21,257 $ 106,791 $ 20,859 $ 17,020 $ 18,697 $ 19,434 $ 17,150 $ 191,692 $ 72,301 $ 55,679
Basic earnings per common share/unit (in dollars per share/unit) $ 0.38 $ 0.19 $ 0.95 $ 0.19 $ 0.16 $ 0.18 $ 0.19 $ 0.17 $ 1.72 [1] $ 0.69 [1] $ 0.56 [1]
Diluted earnings per common share/unit (in dollars per share/unit) $ 0.38 $ 0.19 $ 0.95 $ 0.19 $ 0.16 $ 0.18 $ 0.19 $ 0.17 $ 1.71 [1] $ 0.69 [1] $ 0.56 [1]
Corporate Office Properties, L.P                      
Quarterly Data [Line Items]                      
Total revenues $ 157,785 $ 159,431 $ 175,070 $ 148,940 $ 138,482 $ 137,411 $ 146,743 $ 155,476 $ 641,226 $ 578,112 $ 612,820
Net income 44,877 23,246 109,563 22,318 18,456 20,322 21,085 18,780 200,004 78,643 74,941
Net income attributable to noncontrolling interests (1,515) (1,565) (1,268) (1,037) (1,061) (1,080) (878) (921) (5,385) (3,940) (3,646)
Net income attributable to COPT/COPLP 43,362 21,681 108,295 21,281 17,395 19,242 20,207 17,859 194,619 74,703 71,295
Preferred unit distributions (77) (157) (165) (165) (165) (165) (165) (165) (564) (660) (6,879)
Net income attributable to COPT/COPLP common shareholders $ 43,285 $ 21,524 $ 108,130 $ 21,116 $ 17,230 $ 19,077 $ 20,042 $ 17,694 $ 194,055 $ 74,043 $ 57,569
Basic earnings per common share/unit (in dollars per share/unit) $ 0.38 $ 0.19 $ 0.95 $ 0.19 $ 0.16 $ 0.18 $ 0.19 $ 0.17 $ 1.72 [2] $ 0.69 [2] $ 0.56 [2]
Diluted earnings per common share/unit (in dollars per share/unit) $ 0.38 $ 0.19 $ 0.95 $ 0.19 $ 0.16 $ 0.18 $ 0.19 $ 0.17 $ 1.71 [2] $ 0.69 [2] $ 0.56 [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.