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Information by Business Segment - Segment Financial Information for Our Reportable Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Segment financial information for real estate operations      
Revenues from real estate operations $ 193,266 $ 167,501  
UJV NOI allocable to COPT Defense 1,740 1,642  
Segment assets 4,232,895 4,177,992 $ 4,246,966
Segment assets      
Segment financial information for real estate operations      
Segment assets 3,628,212 3,585,114  
Real Estate Operations      
Segment financial information for real estate operations      
Revenues from real estate operations 166,663 151,681  
Property operating expenses (66,746) (59,420)  
UJV NOI allocable to COPT Defense 1,740 1,642  
NOI from real estate operations 101,657 93,903  
Additions to long-lived assets 36,891 25,237  
Transfers from non-operating properties 38,545 26,413  
Real Estate Operations | Defense/IT Portfolio      
Segment financial information for real estate operations      
Revenues from real estate operations 149,396 133,242  
Property operating expenses (56,201) (48,810)  
UJV NOI allocable to COPT Defense 1,740 1,642  
NOI from real estate operations 94,935 86,074  
Additions to long-lived assets 32,101 21,948  
Transfers from non-operating properties 38,536 26,400  
Real Estate Operations | Defense/IT Portfolio | Fort Meade/BW Corridor      
Segment financial information for real estate operations      
Revenues from real estate operations 78,068 69,777  
Property operating expenses (27,890) (24,520)  
UJV NOI allocable to COPT Defense 0 0  
NOI from real estate operations 50,178 45,257  
Additions to long-lived assets 26,340 12,135  
Transfers from non-operating properties 1,575 5,781  
Real Estate Operations | Defense/IT Portfolio | NoVA Defense/IT      
Segment financial information for real estate operations      
Revenues from real estate operations 21,426 19,829  
Property operating expenses (9,262) (7,572)  
UJV NOI allocable to COPT Defense 0 0  
NOI from real estate operations 12,164 12,257  
Additions to long-lived assets 4,491 2,398  
Transfers from non-operating properties 993 238  
Real Estate Operations | Defense/IT Portfolio | Lackland Air Force Base      
Segment financial information for real estate operations      
Revenues from real estate operations 16,411 15,605  
Property operating expenses (8,688) (7,945)  
UJV NOI allocable to COPT Defense 0 0  
NOI from real estate operations 7,723 7,660  
Additions to long-lived assets 0 62  
Transfers from non-operating properties 9 28  
Real Estate Operations | Defense/IT Portfolio | Navy Support      
Segment financial information for real estate operations      
Revenues from real estate operations 8,226 7,925  
Property operating expenses (3,626) (3,543)  
UJV NOI allocable to COPT Defense 0 0  
NOI from real estate operations 4,600 4,382  
Additions to long-lived assets 598 759  
Transfers from non-operating properties 0 2,650  
Real Estate Operations | Defense/IT Portfolio | Redstone Arsenal      
Segment financial information for real estate operations      
Revenues from real estate operations 16,808 13,414  
Property operating expenses (5,792) (4,636)  
UJV NOI allocable to COPT Defense 0 0  
NOI from real estate operations 11,016 8,778  
Additions to long-lived assets 672 6,594  
Transfers from non-operating properties 32,884 14,392  
Real Estate Operations | Defense/IT Portfolio | Data Center Shells      
Segment financial information for real estate operations      
Revenues from real estate operations 8,457 6,692  
Property operating expenses (943) (594)  
UJV NOI allocable to COPT Defense 1,740 1,642  
NOI from real estate operations 9,254 7,740  
Additions to long-lived assets 0 0  
Transfers from non-operating properties 3,075 3,311  
Real Estate Operations | Other      
Segment financial information for real estate operations      
Revenues from real estate operations 17,267 18,439  
Property operating expenses (10,545) (10,610)  
UJV NOI allocable to COPT Defense 0 0  
NOI from real estate operations 6,722 7,829  
Additions to long-lived assets 4,790 3,289  
Transfers from non-operating properties 9 13  
Real Estate Operations | Segment assets      
Segment financial information for real estate operations      
Segment assets 3,628,212 3,585,114  
Real Estate Operations | Segment assets | Defense/IT Portfolio      
Segment financial information for real estate operations      
Segment assets 3,315,428 3,035,976  
Real Estate Operations | Segment assets | Defense/IT Portfolio | Fort Meade/BW Corridor      
Segment financial information for real estate operations      
Segment assets 1,458,458 1,390,273  
Real Estate Operations | Segment assets | Defense/IT Portfolio | NoVA Defense/IT      
Segment financial information for real estate operations      
Segment assets 489,544 486,649  
Real Estate Operations | Segment assets | Defense/IT Portfolio | Lackland Air Force Base      
Segment financial information for real estate operations      
Segment assets 187,232 193,160  
Real Estate Operations | Segment assets | Defense/IT Portfolio | Navy Support      
Segment financial information for real estate operations      
Segment assets 161,210 169,235  
Real Estate Operations | Segment assets | Defense/IT Portfolio | Redstone Arsenal      
Segment financial information for real estate operations      
Segment assets 584,790 472,237  
Real Estate Operations | Segment assets | Defense/IT Portfolio | Data Center Shells      
Segment financial information for real estate operations      
Segment assets 434,194 324,422  
Real Estate Operations | Segment assets | Other      
Segment financial information for real estate operations      
Segment assets $ 312,784 $ 549,138