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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Allowance for doubtful accounts- AR | $ 1,525 | $ 717
Allowance for deferred rent receivable | 1,962 | 1,418
Accumulated amortization of deferred leasing costs | $ 66,364 | $ 69,998
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 | 94,531,512 | 93,255,284
Common Shares of beneficial interest, shares outstanding | 94,531,512 | 93,255,284
Corporate Office Properties, L.P. [Member] |  |
Allowance for doubtful accounts- AR | $ 1,525 | $ 717
Allowance for deferred rent receivable | 1,962 | 1,418
Accumulated amortization of deferred leasing costs | $ 66,364 | $ 69,998
General Partner [Member] | Corporate Office Properties, L.P. [Member] |  |
Preferred Units, Outstanding | 7,431,667 | 7,431,667
Common Shares of beneficial interest, shares outstanding | 94,531,512 | 93,255,284
Limited Partner [Member] | Corporate Office Properties, L.P. [Member] |  |
Preferred Units, Outstanding | 352,000 | 352,000
Common Shares of beneficial interest, shares outstanding | 3,677,391 | 3,837,551

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