Quarterly report pursuant to Section 13 or 15(d)

Information by Business Segment - Reconciliation of Segment Assets (Details)

v3.20.2
Information by Business Segment - Reconciliation of Segment Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Reconciliation of segment assets to total assets      
Total COPT consolidated assets $ 4,120,189 $ 3,854,453 $ 3,855,369
Operating properties lease liabilities included in segment assets 26,382 $ 17,317  
Segment assets      
Reconciliation of segment assets to total assets      
Total COPT consolidated assets 3,256,968   3,024,072
Operating properties lease liabilities included in segment assets 26,054   16,645
Other assets      
Reconciliation of segment assets to total assets      
Total COPT consolidated assets 642,182   597,301
Non-operating property assets      
Reconciliation of segment assets to total assets      
Total COPT consolidated assets $ 194,985   $ 217,351