Annual report pursuant to Section 13 and 15(d)

Information by Business Segment (Assets Reconciliation) (Details)

v3.20.4
Information by Business Segment (Assets Reconciliation) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of segment assets to total assets    
Total COPT consolidated assets $ 4,077,023 $ 3,854,453
Operating properties lease liabilities included in segment assets 30,746 17,317
Segment assets    
Reconciliation of segment assets to total assets    
Total COPT consolidated assets 3,388,978 3,024,958
Operating properties lease liabilities included in segment assets 30,721 17,317
Non-operating property assets    
Reconciliation of segment assets to total assets    
Total COPT consolidated assets 466,991 621,630
Other assets    
Reconciliation of segment assets to total assets    
Total COPT consolidated assets $ 190,333 $ 190,548