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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Allowance for doubtful accounts- AR | $ 830 | $ 607
Allowance for deferred rent receivable | 264 | 364
Accumulated amortization of deferred leasing costs | $ 31,994 | $ 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 | 110,241,868 | 101,292,299
Common Shares of beneficial interest, shares outstanding | 110,241,868 | 101,292,299
Corporate Office Properties, L.P. [Member] |  |
Allowance for doubtful accounts- AR | $ 830 | $ 607
Allowance for deferred rent receivable | 264 | 364
Accumulated amortization of deferred leasing costs | $ 31,994 | $ 29,560
General Partner [Member] | Corporate Office Properties, L.P. [Member] |  |
Common Shares of beneficial interest, shares outstanding | 110,241,868 | 101,292,299
Limited Partner [Member] | Corporate Office Properties, L.P. [Member] |  |
Preferred Units, Outstanding | 352,000 | 352,000
Common Shares of beneficial interest, shares outstanding | 1,332,886 | 3,250,878

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