Annual report pursuant to Section 13 and 15(d)

Information by Business Segment (Reconciliation of Revenue) (Details)

v3.20.4
Information by Business Segment (Reconciliation of Revenue) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of segment revenues to total revenues      
Construction contract and other service revenues $ 70,640 $ 113,763 $ 60,859
Total revenues 609,365 641,226 578,112
Reconciliation of UJV NOI allocable to COPT to Equity Income in Unconsolidated entities [Abstract]      
UJV NOI allocable to COPT 6,951 5,705 4,818
Less: Income from UJV allocable to COPT attributable to depreciation and amortization expense and interest expense (5,120) (4,065) (3,314)
Add: Equity in (loss) income of unconsolidated non-real estate entities (6) (7) 1,193
Equity in income of unconsolidated entities 1,825 1,633 2,697
Computation of net operating income from service operations      
Construction contract and other service revenues 70,640 113,763 60,859
Construction contract and other service expenses (67,615) (109,962) (58,326)
Real estate operations      
Reconciliation of segment revenues to total revenues      
Total revenues 538,725 527,463 517,253
Reconciliation of UJV NOI allocable to COPT to Equity Income in Unconsolidated entities [Abstract]      
UJV NOI allocable to COPT 6,951 5,705 4,818
Service operations      
Computation of net operating income from service operations      
NOI from service operations $ 3,025 $ 3,801 $ 2,533