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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Allowance for doubtful accounts - AR | $ 850 | $ 607
Deferred rent receivable | 438 | 364
Deferred leasing costs, accumulated amortization | $ 30,832 | $ 29,560
Common Shares of beneficial interest, par value (in dollars per share) | $ 0.01 | $ 0.01
Common Shares of beneficial interest, shares authorized | 150,000,000 | 150,000,000
Common Shares of beneficial interest, shares issued | 108,848,223 | 101,292,299
Common Shares of beneficial interest, shares outstanding | 108,848,223 | 101,292,299
Corporate Office Properties, L.P. |  |
Allowance for doubtful accounts - AR | $ 850 | $ 607
Deferred rent receivable | 438 | 364
Deferred leasing costs, accumulated amortization | $ 30,832 | $ 29,560
Corporate Office Properties, L.P. | General Partner |  |
Common Shares of beneficial interest, shares outstanding | 108,848,223 | 101,292,299
Corporate Office Properties, L.P. | Limited Partner |  |
Common Shares of beneficial interest, shares outstanding | 1,355,251 | 3,250,878
Preferred Units, Outstanding | 352,000 | 352,000

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