Annual report pursuant to Section 13 and 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 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of segment revenues to total revenues                      
Construction contract and other service revenues                 $ 107,876 $ 70,640 $ 113,763
Less: Revenues from discontinued operations (Note 4)                 (30,490) (27,011) (29,405)
Total revenues $ 185,932 $ 166,919 $ 157,207 $ 154,388 $ 156,607 $ 148,801 $ 138,321 $ 138,625 664,446 582,354 611,821
Operating Expenses [Abstract]                      
Property operating expenses                 213,377 190,796 185,449
Less: Property operating expenses from discontinued operations (Note 4)                 (16,842) (13,044) (12,694)
Reconciliation of UJV NOI allocable to COPT to Equity Income in Unconsolidated entities [Abstract]                      
UJV NOI allocable to COPT                 4,029 6,951 5,705
Less: Income from UJVs allocable to COPT attributable to depreciation and amortization expense and interest expense                 (2,930) (5,120) (4,065)
Add: Equity in loss of unconsolidated non-real estate entities                 (6) (6) (7)
Equity in income of unconsolidated entities                 1,093 1,825 1,633
Computation of net operating income from service operations                      
Construction contract and other service revenues                 107,876 70,640 113,763
Construction contract and other service expenses                 (104,053) (67,615) (109,962)
Real estate operations                      
Reconciliation of segment revenues to total revenues                      
Total revenues                 587,060 538,725 527,463
Operating Expenses [Abstract]                      
Property operating expenses                 230,219 203,840 198,143
Less: Property operating expenses from discontinued operations (Note 4)                 (16,842) (13,044) (12,694)
Reconciliation of UJV NOI allocable to COPT to Equity Income in Unconsolidated entities [Abstract]                      
UJV NOI allocable to COPT                 4,029 6,951 5,705
Service operations                      
Computation of net operating income from service operations                      
NOI from service operations                 $ 3,823 $ 3,025 $ 3,801