Share-Based Compensation and Other Compensation Matters (Tables)
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12 Months Ended |
Dec. 31, 2025 |
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| Share-Based Payment Arrangement [Abstract] |
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| Schedule of Reporting for Share-Based Compensation Cost |
The table below sets forth our reporting for share based compensation cost (in thousands): | | | | | | | | | | | | | | | | | | | | | | | For the Years Ended December 31, | | | 2025 | | 2024 | | 2023 | | General, administrative, leasing and other expenses | | $ | 10,150 | | | $ | 9,031 | | | $ | 7,255 | | | Property operating expenses | | 1,543 | | | 1,412 | | | 1,289 | | | Capitalized to development activities | | 694 | | | 525 | | | 576 | | | Share-based compensation cost | | $ | 12,387 | | | $ | 10,968 | | | $ | 9,120 | |
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| Schedule of Restricted Share and TB-PIU Activity |
The following table summarizes restricted shares activity under our share-based compensation plan for 2023, 2024 and 2025: | | | | | | | | | | | | | | | | | Number of Shares | | Weighted Average Grant Date Fair Value | Unvested as of December 31, 2022 | | 325,083 | | | $ | 26.27 | | | Granted | | 220,336 | | | $ | 25.38 | | | Forfeited | | (39,474) | | | $ | 26.03 | | | Vested | | (152,490) | | | $ | 26.09 | | Unvested as of December 31, 2023 | | 353,455 | | | $ | 25.82 | | | Granted | | 184,477 | | | $ | 25.58 | | | Forfeited | | (25,152) | | | $ | 26.20 | | | Vested | | (159,766) | | | $ | 25.85 | | Unvested as of December 31, 2024 | | 353,014 | | | $ | 25.65 | | | Granted | | 260,034 | | | $ | 27.28 | | | Forfeited | | (32,261) | | | $ | 26.73 | | | Vested | | (146,033) | | | $ | 25.63 | | Unvested as of December 31, 2025 | | 434,754 | | | $ | 26.56 | | Unvested shares as of December 31, 2025 that are expected to vest | | 390,047 | | | $ | 26.50 | |
The following table summarizes TB-PIUs activity under our share-based compensation plan for 2023, 2024 and 2025: | | | | | | | | | | | | | | | | | Number of TB-PIUs | | Weighted Average Grant Date Fair Value | Unvested as of December 31, 2022 | | 187,330 | | | $ | 26.19 | | | Granted | | 123,900 | | | $ | 25.40 | | | Forfeited | | (27,182) | | | $ | 26.46 | | | Vested | | (89,633) | | | $ | 25.95 | | Unvested as of December 31, 2023 | | 194,415 | | | $ | 25.76 | | | Granted | | 127,795 | | | $ | 24.57 | | | | | | | | Vested | | (98,271) | | | $ | 25.63 | | Unvested as of December 31, 2024 | | 223,939 | | | $ | 25.14 | | | Granted | | 123,250 | | | $ | 27.11 | | | | | | | | Vested | | (111,286) | | | $ | 25.33 | | Unvested as of December 31, 2025 | | 235,903 | | | $ | 26.08 | | Unvested TB-PIUs as of December 31, 2025 that are expected to vest | | 235,260 | | | $ | 26.08 | |
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| Schedule of PB-PIU's Granted |
We made the following grants of performance-based equity in the form of either PB-PIUs or PSUs to certain senior management team members from 2021 through 2025 as based on the election of the grant recipients (dollars in thousands): | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | PB-PIUs | | PSUs | | Grant Date | | Number of Awards Granted (200% of Target Award) | | | | | | Grant Date Fair Value | | Number of Awards Outstanding as of December 31, 2025 | | Number of Awards Granted (200% of Target Award) | | Grant Date Fair Value | Number of Awards Outstanding as of December 31, 2025 | | 1/1/2021 | | 227,544 | | | | | | | $ | 3,417 | | | — | | | — | | | N/A | — | | | 1/1/2022 | | 231,838 | | | | | | | $ | 3,810 | | | — | | | — | | | N/A | — | | | 1/1/2023 | | 275,402 | | | | | | | $ | 4,343 | | | 225,590 | | | — | | | N/A | — | | | 1/1/2024 | | 299,766 | | | | | | | $ | 5,405 | | | 299,766 | | | — | | | N/A | — | | | 1/1/2025 | | 246,230 | | | | | | | $ | 5,335 | | | 246,230 | | | 20,296 | | | $ | 444 | | 20,296 | |
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| Schedule of Payouts for Defined Performance Under PB-PIU |
The number of earned awards following the end of the performance period will be determined based on the percentile rank of COPT Defense’s total shareholder return (“TSR”) relative to a peer group of companies, as set forth in the following schedule: | | | | | | | | | | Percentile Rank | | Earned Award Payout % | | 75th or greater | | 200% of target award | | 50th (target) | | 100% of target award | | 25th | | 50% of target award | | Below 25th | | 0% of target award |
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| Schedule of Assumptions Used in Monte Carlo Models for PB-PIUs |
The grant date fair value and certain of the assumptions used in the Monte Carlo models for the performance-based equity granted in 2023, 2024 and 2025 are set forth below: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Grant Date | | Grant Date Fair Value Per PB-PIU at Target-Level Award | | Grant Date Fair Value Per PSU at Target-Level Award | Baseline Common Share Value | | Expected Volatility of Common Shares | | Risk-free Interest Rate | | 1/1/2023 | | $ | 31.54 | | | N/A | $ | 25.94 | | | 35.0 | % | | 4.3 | % | | 1/1/2024 | | $ | 36.06 | | | N/A | $ | 25.63 | | | 25.9 | % | | 4.1 | % | | 1/1/2025 | | $ | 43.33 | | | $ | 43.75 | | $ | 30.95 | | | 28.3 | % | | 4.5 | % |
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| Schedule of Deferred Shares Granted |
We made the following grants of deferred share awards to non-employee Trustees in 2023, 2024 and 2025 (dollars in thousands, except per share data): | | | | | | | | | | | | | | | | | | | | | | Year of Grant | | Number of Deferred Share Awards Granted | | Aggregate Grant Date Fair Value | | Grant Date Fair Value Per Award | | 2023 | | 9,046 | | | $ | 215 | | | $ | 23.75 | | | 2024 | | 8,796 | | | $ | 217 | | | $ | 24.66 | | | 2025 | | 3,922 | | | $ | 108 | | | $ | 27.47 | |
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