Quarterly report pursuant to Section 13 or 15(d)

Consolidated Balance Sheets (Parenthetical)

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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Allowance for Doubtful Accounts Receivable $ 5,216 $ 4,694
Preferred Shares of beneficial interest, par value (in dollars per share) $ 0.01 $ 0.01
Preferred Stock, Shares Authorized 25,000,000 25,000,000
Preferred Stock, Shares Issued 9,431,667 12,821,667
Preferred Shares of beneficial interest, shares outstanding 9,431,667 12,821,667
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 85,845,403 80,952,986
Common Shares of beneficial interest, shares outstanding 85,845,403 80,952,986
Corporate Office Properties, L.P.
    
Allowance for Doubtful Accounts Receivable $ 5,216 $ 4,694
Corporate Office Properties, L.P. | General Partner
    
Common Shares of beneficial interest, shares outstanding 85,845,403 80,952,986
Preferred Units, Outstanding 9,431,667 12,821,667
Corporate Office Properties, L.P. | Limited Partner
    
Common Shares of beneficial interest, shares outstanding 3,788,523 4,067,542
Preferred Units, Outstanding 352,000 352,000