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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Allowance for doubtful accounts- AR | $ 603 | $ 1,525
Allowance for deferred rent receivable | 373 | 1,962
Accumulated amortization of deferred leasing costs | $ 65,988 | $ 66,364
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 Shares of beneficial interest, shares issued | 98,498,651 | 94,531,512
Common Shares of beneficial interest, shares outstanding | 98,498,651 | 94,531,512
Corporate Office Properties, L.P. [Member] |  |
Allowance for doubtful accounts- AR | $ 603 | $ 1,525
Allowance for deferred rent receivable | 373 | 1,962
Accumulated amortization of deferred leasing costs | $ 65,988 | $ 66,364
Redeemable preferred units of general partner outstanding, in units | 531,667 |
General Partner [Member] | Corporate Office Properties, L.P. [Member] |  |
Preferred Units, Outstanding | 6,900,000 | 7,431,667
Common Shares of beneficial interest, shares outstanding | 98,498,651 | 94,531,512
Limited Partner [Member] | Corporate Office Properties, L.P. [Member] |  |
Preferred Units, Outstanding | 352,000 | 352,000
Common Shares of beneficial interest, shares outstanding | 3,590,391 | 3,677,391

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