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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Accumulated amortization of deferred leasing costs | $ 34,198 | $ 31,994
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 | 112,059,175 | 110,241,868
Common Shares of beneficial interest, shares outstanding | 112,059,175 | 110,241,868
Corporate Office Properties, L.P. |  |
Accumulated amortization of deferred leasing costs | $ 34,198 | $ 31,994
Corporate Office Properties, L.P. | General Partner |  |
Common Shares of beneficial interest, shares outstanding | 112,059,175 | 110,241,868
Corporate Office Properties, L.P. | Limited Partner |  |
Common Shares of beneficial interest, shares outstanding | 1,484,425 | 1,332,886
Preferred Units, Outstanding | 352,000 | 352,000

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