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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Allowance for doubtful accounts - AR | $ 1,789 | $ 1,525
Deferred rent receivable | 881 | 1,962
Deferred leasing costs, accumulated amortization | $ 66,237 | $ 66,364
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 | 94,661,381 | 94,531,512
Common Shares of beneficial interest, shares outstanding | 94,661,381 | 94,531,512
Corporate Office Properties, L.P. |  |
Allowance for doubtful accounts - AR | $ 1,789 | $ 1,525
Deferred rent receivable | 881 | 1,962
Deferred leasing costs, accumulated amortization | $ 66,237 | $ 66,364
Corporate Office Properties, L.P. | General Partner |  |
Common Shares of beneficial interest, shares outstanding | 94,661,381 | 94,531,512
Preferred Units, Outstanding | 7,431,667 | 7,431,667
Corporate Office Properties, L.P. | Limited Partner |  |
Common Shares of beneficial interest, shares outstanding | 3,677,391 | 3,677,391
Preferred Units, Outstanding | 352,000 | 352,000

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