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Information by Business Segment (Details 4) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018
--- | --- | --- | ---
Reconciliation of segment assets to total assets |  |  |
Total COPT consolidated assets | $ 3,855,369 | $ 3,656,005 | $ 3,650,366
Operating properties lease liabilities included in segment assets | 16,686 |  |
Segment assets |  |  |
Reconciliation of segment assets to total assets |  |  |
Total COPT consolidated assets | 3,024,072 |  | 3,074,986
Operating properties lease liabilities included in segment assets | 16,645 |  | 0
Non-operating property assets |  |  |
Reconciliation of segment assets to total assets |  |  |
Total COPT consolidated assets | 597,301 |  | 420,109
Other assets |  |  |
Reconciliation of segment assets to total assets |  |  |
Total COPT consolidated assets | $ 217,351 |  | $ 155,271

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