Annual report pursuant to Section 13 and 15(d)

Earnings Per Share ("EPS") and Earnings Per Unit (???EPU???) (Details 2)

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Earnings Per Share ("EPS") and Earnings Per Unit (“EPU”) (Details 2) - shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Conversion of common units      
Antidilutive securities      
Weighted average antidilutive securities excluded from computation of diluted earnings per share (in shares/units) 1,299,000 2,468,000 3,362,000
Conversion of redeemable noncontrolling interests      
Antidilutive securities      
Weighted average antidilutive securities excluded from computation of diluted earnings per share (in shares/units) 896,000 936,000 689,000
Conversion of Series I preferred units      
Antidilutive securities      
Weighted average antidilutive securities excluded from computation of diluted earnings per share (in shares/units) 176,000 176,000 176,000
Forward Equity Sale Agreement      
Antidilutive securities      
Weighted average antidilutive securities excluded from computation of diluted earnings per share (in shares/units) 376,000    
Weighted average restricted shares/units and deferred share awards      
Antidilutive securities      
Weighted average antidilutive securities excluded from computation of diluted earnings per share (in shares/units) 441,000 452,000 433,000
Weighted average stock options      
Antidilutive securities      
Weighted average antidilutive securities excluded from computation of diluted earnings per share (in shares/units) 12,000 42,000 70,000
Unvested PIUs      
Antidilutive securities      
Weighted average antidilutive securities excluded from computation of diluted earnings per share (in shares/units) 51,000    
Corporate Office Properties, L.P | Conversion of redeemable noncontrolling interests      
Antidilutive securities      
Weighted average antidilutive securities excluded from computation of diluted earnings per share (in shares/units) 896,000 936,000 689,000
Corporate Office Properties, L.P | Conversion of Series I preferred units      
Antidilutive securities      
Weighted average antidilutive securities excluded from computation of diluted earnings per share (in shares/units) 176,000 176,000 176,000
Corporate Office Properties, L.P | Weighted average restricted shares/units and deferred share awards      
Antidilutive securities      
Weighted average antidilutive securities excluded from computation of diluted earnings per share (in shares/units) 441,000 452,000 433,000
Corporate Office Properties, L.P | Weighted average stock options      
Antidilutive securities      
Weighted average antidilutive securities excluded from computation of diluted earnings per share (in shares/units) 12,000 42,000 70,000