Quarterly report pursuant to Section 13 or 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
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Reconciliation of segment revenues to total revenues        
Construction contract and other service revenues $ 14,243 $ 42,557 $ 30,063 $ 95,757
Less: Revenues from discontinued operations 0 0 0 (1,980)
Total revenues 169,196 185,803 336,697 381,283
Operating Expenses [Abstract]        
Less: Property operating expenses from discontinued operations 0 0 0 (971)
Total property operating expenses 61,600 54,116 121,020 111,297
Reconciliation of UJV NOI allocable to COPT to Equity Income in Unconsolidated entities [Abstract]        
UJV NOI allocable to COPT 1,671 1,080 3,313 2,160
Less: Income from UJV allocable to COPT attributable to depreciation and amortization expense and interest expense (1,559) (760) (3,263) (1,518)
Add: Equity in (loss) income of unconsolidated non-real estate entities (1) (2) (3) 564
Equity in income of unconsolidated entities 111 318 47 1,206
Computation of net operating income from service operations        
Construction contract and other service revenues 14,243 42,557 30,063 95,757
Construction contract and other service expenses (13,555) (41,304) (28,756) (92,954)
Real estate operations        
Reconciliation of segment revenues to total revenues        
Total revenues 154,953 143,246 306,634 287,506
Operating Expenses [Abstract]        
Property operating expenses 61,600 54,116 121,020 112,268
Less: Property operating expenses from discontinued operations 0 0 0 (971)
Reconciliation of UJV NOI allocable to COPT to Equity Income in Unconsolidated entities [Abstract]        
UJV NOI allocable to COPT 1,671 1,080 3,313 2,160
Service operations        
Computation of net operating income from service operations        
NOI from service operations $ 688 $ 1,253 $ 1,307 $ 2,803