Quarterly report [Sections 13 or 15(d)]

Information by Business Segment - Reconciliation of UJV NOI Allocable to COPT Defense to Equity in Income (Loss) of Unconsolidated Entities (Details)

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Information by Business Segment - Reconciliation of UJV NOI Allocable to COPT Defense to Equity in Income (Loss) of Unconsolidated Entities (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Segment financial information for real estate operations    
UJV NOI allocable to COPT Defense $ 2,056 $ 1,889
Less: Income from UJV allocable to COPT Defense attributable to depreciation and amortization expense, interest expense, gain on sale of real estate, and loss on early extinguishment of debt (650) (1,518)
Equity in income of unconsolidated entities 1,406 371
Reportable segments    
Segment financial information for real estate operations    
UJV NOI allocable to COPT Defense $ 2,056 $ 1,889