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, 2022
Mar. 31, 2021
Reconciliation of segment revenues to total revenues    
Construction contract and other service revenues $ 53,200 $ 16,558
Revenues from real estate operations from discontinued operations (Note 4) (1,980) (7,334)
Total revenues 195,480 154,388
Operating Expenses [Abstract]    
Less: Property operating expenses from discontinued operations (Note 4) (971) (3,698)
Total property operating expenses 57,181 53,276
Reconciliation of UJV NOI allocable to COPT to Equity Income in Unconsolidated entities [Abstract]    
UJV NOI allocable to COPT 1,080 917
Less: Income from UJV allocable to COPT attributable to depreciation and amortization expense and interest expense (758) (693)
Add: Equity in income (loss) of unconsolidated non-real estate entities 566 (2)
Equity in income of unconsolidated entities 888 222
Computation of net operating income from service operations    
Construction contract and other service revenues 53,200 16,558
Construction contract and other service expenses (51,650) (15,793)
Real estate operations    
Reconciliation of segment revenues to total revenues    
Total revenues 144,260 145,164
Operating Expenses [Abstract]    
Property operating expenses 58,152 56,974
Less: Property operating expenses from discontinued operations (Note 4) (971) (3,698)
Reconciliation of UJV NOI allocable to COPT to Equity Income in Unconsolidated entities [Abstract]    
UJV NOI allocable to COPT 1,080 917
Service operations    
Computation of net operating income from service operations    
NOI from service operations $ 1,550 $ 765