Information by Business Segment (Details 4) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
Reconciliation of segment assets to total assets
Total COPT consolidated assets	$ 4,011,325	$ 3,854,453	$ 3,803,469
Operating properties lease liabilities included in segment assets	20,796	$ 17,317
Segment assets
Reconciliation of segment assets to total assets
Total COPT consolidated assets	3,140,539		3,036,140
Operating properties lease liabilities included in segment assets	19,073		16,502
Other assets
Reconciliation of segment assets to total assets
Total COPT consolidated assets	679,207		523,801
Non-operating property assets
Reconciliation of segment assets to total assets
Total COPT consolidated assets	$ 172,506		$ 227,026