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, 2021
Mar. 31, 2020
Reconciliation of segment revenues to total revenues    
Total revenues $ 161,722 $ 145,797
Construction contract and other service revenues 16,558 13,681
Reconciliation of UJV NOI allocable to COPT to Equity Income in Unconsolidated entities [Abstract]    
UJV NOI allocable to COPT 917 1,713
Less: Income from UJV allocable to COPT attributable to depreciation and amortization expense and interest expense (693) (1,270)
Add: Equity in (loss) income of unconsolidated non-real estate entities (2) (2)
Equity in income of unconsolidated entities 222 441
Computation of net operating income from service operations    
Construction contract and other service revenues 16,558 13,681
Construction contract and other service expenses (15,793) (13,121)
Real estate operations    
Reconciliation of segment revenues to total revenues    
Total revenues 145,164 132,116
Reconciliation of UJV NOI allocable to COPT to Equity Income in Unconsolidated entities [Abstract]    
UJV NOI allocable to COPT 917 1,713
Service operations    
Computation of net operating income from service operations    
NOI from service operations $ 765 $ 560