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
Mar. 31, 2023
Mar. 31, 2022
Reconciliation of segment revenues to total revenues    
Construction contract and other service revenues $ 15,820 $ 53,200
Less: Revenues from discontinued operations 0 (1,980)
Total revenues 167,501 195,480
Operating Expenses [Abstract]    
Less: Property operating expenses from discontinued operations 0 (971)
Total property operating expenses 59,420 57,181
Reconciliation of UJV NOI allocable to COPT to Equity Income in Unconsolidated entities [Abstract]    
UJV NOI allocable to COPT 1,642 1,080
Less: Income from UJV allocable to COPT attributable to depreciation and amortization expense and interest expense (1,704) (758)
Add: Equity in (loss) income of unconsolidated non-real estate entities (2) 566
Equity in (loss) income of unconsolidated entities (64) 888
Computation of net operating income from service operations    
Construction contract and other service revenues 15,820 53,200
Construction contract and other service expenses (15,201) (51,650)
Real estate operations    
Reconciliation of segment revenues to total revenues    
Total revenues 151,681 144,260
Operating Expenses [Abstract]    
Property operating expenses 59,420 58,152
Less: Property operating expenses from discontinued operations 0 (971)
Reconciliation of UJV NOI allocable to COPT to Equity Income in Unconsolidated entities [Abstract]    
UJV NOI allocable to COPT 1,642 1,080
Service operations    
Computation of net operating income from service operations    
NOI from service operations $ 619 $ 1,550