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Consolidated Balance Sheets (Parenthetical 2) (USD $) In Thousands, except Share data, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Allowance for doubtful accounts | $ 5,344 | $ 4,694
Common Shares of beneficial interest, shares outstanding | 87,381,395 | 80,952,986
Corporate Office Properties, L.P. |  |
Allowance for doubtful accounts | $ 5,344 | $ 4,694
Corporate Office Properties, L.P. | General Partner |  |
Preferred Units, Outstanding | 9,431,667 | 12,821,667
Common Shares of beneficial interest, shares outstanding | 87,381,395 | 80,952,986
Corporate Office Properties, L.P. | Limited Partner |  |
Preferred Units, Outstanding | 352,000 | 352,000
Common Shares of beneficial interest, shares outstanding | 3,978,154 | 4,067,542

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