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Share-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2025
Share-Based Payment Arrangement [Abstract] |
Schedule of Restricted Share and TB-PIU Activity | The following table summarizes restricted shares activity under our share-based compensation plan for the nine months ended September 30, 2025:
|  | Number of Shares |  | Weighted Average Grant Date Fair Value
Unvested as of December 31, 2024 |  | 353,014 |  |  | $ | 25.65 |
Granted |  | 250,434 |  |  | $ | 27.16 |
Forfeited |  | (23,481) |  |  | $ | 26.55 |
Vested |  | (138,547) |  |  | $ | 25.48 |
Unvested as of September 30, 2025 |  | 441,420 |  |  | $ | 26.51 |
The following table summarizes TB-PIUs activity under our share-based compensation plans for the nine months ended September 30, 2025:
|  | Number of TB-PIUs |  | Weighted Average Grant Date Fair Value
Unvested as of December 31, 2024 |  | 223,939 |  |  | $ | 25.14 |
Granted |  | 123,250 |  |  | $ | 27.11 |
Vested |  | (106,592) |  |  | $ | 25.32 |
Unvested as of September 30, 2025 |  | 240,597 |  |  | $ | 26.07 |
Schedule of Payouts for Performance-Based Awards | 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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- Definition Schedule of Share-based Compensation Arrangement by Share-based Payment Award For Performance Shares + References No definition available. + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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