Quarterly report pursuant to Section 13 or 15(d)

Earnings Per Share ("EPS") (Details 2)

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Earnings Per Share ("EPS") (Details 2)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Conversion of common units
       
Antidilutive securities        
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 3,804 4,233 3,832 4,256
Conversion of Series I Preferred Units
       
Antidilutive securities        
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 176 176 176 176
Conversion of Series K Preferred Shares
       
Antidilutive securities        
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 434 434 434 434
Weighted average restricted shares
       
Antidilutive securities        
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 377 420 388 475
Weighted average options
       
Antidilutive securities        
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 613 752 571 780
Corporate Office Properties, L.P. | Weighted average restricted shares
       
Antidilutive securities        
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 377 420 388 475
Corporate Office Properties, L.P. | Weighted average options
       
Antidilutive securities        
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 613 752 571 780
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) 176 176 176 176
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) 434 434 434 434