Quarterly report pursuant to Section 13 or 15(d)

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

v3.4.0.3
Earnings Per Share ("EPS") and Earnings Per Unit ("EPU") (Details 2) - shares
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Conversion of common units    
Antidilutive securities    
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 3,677,000 3,732,000
Conversion of Series I Preferred Units    
Antidilutive securities    
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 176,000 176,000
Conversion of Series K Preferred Shares    
Antidilutive securities    
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 434,000 434,000
Weighted average restricted stock and deferred shares    
Antidilutive securities    
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 405,000 400,000
Weighted average options    
Antidilutive securities    
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 379,000 474,000
Corporate Office Properties, L.P. | Weighted average restricted stock and deferred shares    
Antidilutive securities    
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 405,000 400,000
Corporate Office Properties, L.P. | Weighted average options    
Antidilutive securities    
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 379,000 474,000
Corporate Office Properties, L.P. | Conversion of Series I preferred units    
Antidilutive securities    
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 176,000 176,000
Corporate Office Properties, L.P. | Conversion of Series K preferred units    
Antidilutive securities    
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 434,000 434,000