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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Reconciliation of segment revenues to total revenues        
Construction contract and other service revenues $ 11,949 $ 34,813 $ 42,012 $ 130,570
Less: Revenues from discontinued operations 0 0 0 (1,980)
Total revenues 168,556 182,500 505,253 563,783
Operating Expenses [Abstract]        
Less: Property operating expenses from discontinued operations 0 0 0 (971)
Total property operating expenses 61,788 57,663 182,808 168,960
Reconciliation of UJV NOI allocable to COPT to Equity Income in Unconsolidated entities [Abstract]        
UJV NOI allocable to CDP 1,675 1,072 4,988 3,232
Less: Income from UJV allocable to CDP attributable to depreciation and amortization expense and interest expense (1,743) (762) (5,006) (2,280)
Add: Equity in (loss) income of unconsolidated non-real estate entities 0 (2) (3) 562
Equity in (loss) income of unconsolidated entities (68) 308 (21) 1,514
Computation of net operating income from service operations        
Construction contract and other service revenues 11,949 34,813 42,012 130,570
Construction contract and other service expenses (11,493) (33,555) (40,249) (126,509)
Real Estate Operations        
Reconciliation of segment revenues to total revenues        
Total revenues 156,607 147,687 463,241 435,193
Operating Expenses [Abstract]        
Property operating expenses 61,788 57,663 182,808 169,931
Less: Property operating expenses from discontinued operations 0 0 0 (971)
Reconciliation of UJV NOI allocable to COPT to Equity Income in Unconsolidated entities [Abstract]        
UJV NOI allocable to CDP 1,675 1,072 4,988 3,232
Service Operations        
Computation of net operating income from service operations        
NOI from service operations $ 456 $ 1,258 $ 1,763 $ 4,061