Annual report pursuant to Section 13 and 15(d)

Equity - COPLP and Subsidiaries (Details)

v3.20.4
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