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 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Reconciliation of segment revenues to total revenues        
Total revenues $ 174,636 $ 154,766 $ 500,769 $ 445,337
Construction contract and other service revenues 28,046 20,323 64,592 46,240
Reconciliation of UJV NOI allocable to COPT to Equity Income in Unconsolidated entities [Abstract]        
UJV NOI allocable to COPT 1,060 1,752 2,950 5,190
Less: Income from UJV allocable to COPT attributable to depreciation and amortization expense and interest expense (763) (1,274) (2,167) (3,814)
Add: Equity in loss of unconsolidated non-real estate entities 0 (1) (4) (4)
Equity in income of unconsolidated entities 297 477 779 1,372
Computation of net operating income from service operations        
Construction contract and other service revenues 28,046 20,323 64,592 46,240
Construction contract and other service expenses (27,089) (19,220) (61,964) (44,052)
Real estate operations        
Reconciliation of segment revenues to total revenues        
Total revenues 146,590 134,443 436,177 399,097
Reconciliation of UJV NOI allocable to COPT to Equity Income in Unconsolidated entities [Abstract]        
UJV NOI allocable to COPT 1,060 1,752 2,950 5,190
Service operations        
Computation of net operating income from service operations        
NOI from service operations $ 957 $ 1,103 $ 2,628 $ 2,188