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Equity - COPLP and Subsidiaries (Details) $ / shares in Units, $ in Thousands |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 21, 2020 USD ($) $ / shares shares | Dec. 20, 2020 | Sep. 23, 2019 | Sep. 22, 2019 | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares
Preferred Stock |  |  |  |  |  |  |
Redemption of preferred units |  |  |  |  | $ 8,800 |  |
Common Shares |  |  |  |  |  |  |
Number of common shares for each converted common unit (in shares) | shares |  |  |  |  | 1 | 1 | 1
Number of operating partnerships units converted into common shares (in units) | shares |  |  |  |  | 14,009 | 105,039 | 1,904,615
Redemption of common units |  |  |  |  |  | $ 25 | $ 339
Dividends declared per common share (in dollars per share) | $ / shares |  |  |  |  | $ 1.10 | $ 1.10 | $ 1.10
Common Shares | Forward Equity Sale Agreement |  |  |  |  |  |  |
Common Shares |  |  |  |  |  |  |
Shares issued to the public (in units) | shares |  |  |  |  |  | 1,600,000 | 5,900,000
Net proceeds from issuance of shares after underwriting discounts and commissions but before offering expenses |  |  |  |  |  | $ 46,500 | $ 172,500
Common Shares | 2016 ATM Program |  |  |  |  |  |  |
Common Shares |  |  |  |  |  |  |
Shares issued to the public (in units) | shares |  |  |  |  |  |  | 992,000
Net proceeds from issuance of shares after underwriting discounts and commissions but before offering expenses |  |  |  |  |  |  | $ 29,800
Issuance of stock, weighted average price per share (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 30.46
Payments of stock issuance costs |  |  |  |  |  |  | $ 500
Corporate Office Properties, L.P |  |  |  |  |  |  |
Preferred Stock |  |  |  |  |  |  |
Redemption of preferred units |  |  |  |  | $ 8,800 |  |
Common Shares |  |  |  |  |  |  |
Number of common shares for each converted common unit (in shares) | shares |  |  |  |  | 1 | 1 | 1
Number of operating partnerships units converted into common shares (in units) | shares |  |  |  |  | 14,009 | 105,039 | 1,900,000
Redemption of common units |  |  |  |  |  | $ 25 | $ 339
Dividends declared per common share (in dollars per share) | $ / shares |  |  |  |  | $ 1.10 | $ 1.10 | $ 1.10
Corporate Office Properties, L.P | Common Shares |  |  |  |  |  |  |
Common Shares |  |  |  |  |  |  |
Stock redeemed or called during period (in units/ shares) | shares |  |  |  |  |  | 924 | 13,377
Redemption of common units |  |  |  |  |  | $ 25 | $ 339
Corporate Office Properties, L.P | Common Units |  |  |  |  |  |  |
Common Shares |  |  |  |  |  |  |
Stock redeemed or called during period (in units/ shares) | shares |  |  |  |  |  | 924 | 13,377
Redemption of common units |  |  |  |  |  | $ 25 | $ 339
Corporate Office Properties, L.P | Common Units | COPT |  |  |  |  |  |  |
Common Shares |  |  |  |  |  |  |
Percentage ownership in operating partnership |  |  |  |  | 98.60% | 98.70% |
Corporate Office Properties, L.P | Conversion of Series I preferred units |  |  |  |  |  |  |
Preferred Stock |  |  |  |  |  |  |
Redemption of preferred units (in units) | shares | 352,000 |  |  |  |  |  |
Redemption of preferred units | $ 8,800 |  |  |  |  |  |
Preferred stock, redemption price per share (in dollars per share) | $ / shares | $ 25.00 |  |  |  |  |  |
Annual dividend yield |  |  | 3.50% | 7.50% |  |  |
Limited partner preferred units conversion rate to shares |  | 0.5 |  |  |  |  |

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