Quarterly report pursuant to Section 13 or 15(d)

Consolidated Balance Sheets (Parenthetical)

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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Allowance for doubtful accounts - AR $ 1,135 $ 717
Allowance - Deferred rent receivable $ 2,203 $ 1,418
Preferred Shares of beneficial interest, par value (in dollars per share) $ 0.01 $ 0.01
Preferred Shares of beneficial interest, shares authorized 25,000,000 25,000,000
Preferred Shares of beneficial interest, shares issued 7,431,667 7,431,667
Preferred Shares of beneficial interest, shares outstanding 7,431,667 7,431,667
Common Shares of beneficial interest, par value (in dollars per share) $ 0.01 $ 0.01
Common Shares of beneficial interest, shares authorized 125,000,000 125,000,000
Common Stock, Shares, Issued 94,529,618 93,255,284
Common Shares of beneficial interest, shares outstanding 94,529,618 93,255,284
Corporate Office Properties, L.P.    
Allowance for doubtful accounts - AR $ 1,135 $ 717
Allowance - Deferred rent receivable $ 2,203 $ 1,418
Corporate Office Properties, L.P. | General Partner    
Common Shares of beneficial interest, shares outstanding 94,529,618 93,255,284
Preferred Units, Outstanding 7,431,667 7,431,667
Corporate Office Properties, L.P. | Limited Partner    
Common Shares of beneficial interest, shares outstanding 3,679,551 3,837,551
Preferred Units, Outstanding 352,000 352,000