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Prepaid Expenses and Other Assets, Net (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Property, Plant and Equipment [Line Items] |  |  |  |
Restricted cash | $ 3,884 | $ 2,570 | $ 2,756 | $ 1,953
Marketable securities in deferred compensation plan | 3,868 | 4,616 |  |
Total for COPT and subsidiaries | 85,581 | 71,334 |  |
Corporate Office Properties, L.P. [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Prepaid expenses | 25,658 | 24,670 |  |
Lease incentives, net | 21,258 | 19,011 |  |
Furniture, fixtures and equipment, net | 8,630 | 5,256 |  |
Non-real estate equity investments | 5,940 | 5,056 |  |
Deferred financing costs, net | 4,733 | 1,202 |  |
Restricted cash | 3,884 | 2,570 | $ 2,756 | $ 1,953
Construction contract costs incurred in excess of billings | 3,189 | 4,884 |  |
Deferred tax asset, net | 2,084 | 1,892 |  |
Other assets | 6,337 | 2,177 |  |
Total for COPT and subsidiaries | $ 81,713 | $ 66,718 |  |

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