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Equity (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 23, 2019 | Sep. 22, 2019 | Jul. 31, 2019 | Mar. 27, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred units in COPLP |  |  |  |  | $ 8,800 |  | $ 8,800 |  | $ 8,800
Conversion of common units to common shares (in units/shares) |  |  |  |  | 97,539 | 1,841,810 | 103,039 | 1,895,627 |
Dividends declared per share (in usd per share) |  |  |  |  | $ 0.275 | $ 0.275 | $ 0.825 | $ 0.825 |
Common Shares | Forward Equity Sale Agreement |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Number of shares issued |  |  |  | 1,600,000 |  |  |  |  |
Proceeds from common shares issued under forward equity sale agreements |  |  |  | $ 46,500 |  |  |  |  |
Common Shares | 2018 Common Stock Issued to Public Under At-the-Market Program |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Aggregate gross sales price |  |  |  |  | $ 300,000 |  | $ 300,000 |  |
Corporate Office Properties, L.P. |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Dividends declared per share (in usd per share) |  |  |  |  | $ 0.275 | $ 0.275 | $ 0.825 | $ 0.825 |
Series I Preferred Units | Corporate Office Properties, L.P. |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Number of limited partners' preferred units outstanding (in units) |  |  |  |  | 352,000 |  | 352,000 |  |
Preferred units in COPLP |  |  |  |  | $ 8,800 |  | $ 8,800 |  |
Liquidation preference of preferred stock per share (in usd per share) |  |  |  |  | $ 25.00 |  | $ 25.00 |  |
Preferred stock dividend rate (percent) | 3.50% | 7.50% |  |  |  |  |  |  |
Preferred stock redemption notification period |  |  | 6 months |  |  |  |  |  |

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