Annual report pursuant to Section 13 and 15(d)

Information by Business Segment - Reconciliation of Revenue (Details)

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Information by Business Segment - Reconciliation of Revenue (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Reconciliation of segment revenues to total revenues      
Construction contract and other service revenues $ 60,179 $ 154,632 $ 107,876
Less: Revenues from discontinued operations (Note 4) 0 (1,980) (30,490)
Total revenues 684,982 739,030 664,446
Operating expenses      
Less: Property operating expenses from discontinued operations (Note 4) 0 (971) (16,842)
Total property operating expenses 247,385 227,430 213,377
Reconciliation of UJV NOI allocable to COPT to Equity Income in Unconsolidated entities [Abstract]      
UJV NOI allocable to COPT Defense 6,659 4,327 4,029
Less: Income from UJVs allocable to COPT Defense attributable to depreciation and amortization expense, interest expense and gain on early extinguishment of debt (6,917) (3,145) (2,930)
Add: Equity in (loss) income of unconsolidated non-real estate entities (3) 561 (6)
Equity in (loss) income of unconsolidated entities (261) 1,743 1,093
Computation of net operating income from service operations      
Construction contract and other service revenues 60,179 154,632 107,876
Construction contract and other service expenses (57,416) (149,963) (104,053)
Real estate operations      
Reconciliation of segment revenues to total revenues      
Total revenues 624,803 586,378 587,060
Operating expenses      
Segment property operating expenses 247,385 228,401 230,219
Less: Property operating expenses from discontinued operations (Note 4) 0 (971) (16,842)
Reconciliation of UJV NOI allocable to COPT to Equity Income in Unconsolidated entities [Abstract]      
UJV NOI allocable to COPT Defense 6,659 4,327 4,029
Service operations      
Computation of net operating income from service operations      
NOI from service operations $ 2,763 $ 4,669 $ 3,823