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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Reconciliation of segment revenues to total revenues        
Total revenues $ 164,411 $ 144,774 $ 326,133 $ 290,571
Construction contract and other service revenues 19,988 12,236 36,546 25,917
Reconciliation of UJV NOI allocable to COPT to Equity Income in Unconsolidated entities [Abstract]        
UJV NOI allocable to COPT 973 1,725 1,890 3,438
Less: Income from UJV allocable to COPT attributable to depreciation and amortization expense and interest expense (711) (1,270) (1,404) (2,540)
Add: Equity in loss of unconsolidated non-real estate entities (2) (1) (4) (3)
Equity in income of unconsolidated entities 260 454 482 895
Computation of net operating income from service operations        
Construction contract and other service revenues 19,988 12,236 36,546 25,917
Construction contract and other service expenses (19,082) (11,711) (34,875) (24,832)
Real estate operations        
Reconciliation of segment revenues to total revenues        
Total revenues 144,423 132,538 289,587 264,654
Reconciliation of UJV NOI allocable to COPT to Equity Income in Unconsolidated entities [Abstract]        
UJV NOI allocable to COPT 973 1,725 1,890 3,438
Service operations        
Computation of net operating income from service operations        
NOI from service operations $ 906 $ 525 $ 1,671 $ 1,085