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Share-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2026
Share-Based Payment Arrangement [Abstract] |
Schedule of Restricted Share and TB-PIU Activity | The table below presents restricted shares activity under our share-based compensation plan for the three months ended March 31, 2026:
|  | Number of Shares |  | Weighted Average Grant Date Fair Value
Unvested as of December 31, 2025 |  | 434,754 |  |  | $ | 26.56 |
Granted |  | 221,189 |  |  | $ | 31.78 |
Forfeited |  | (5,757) |  |  | $ | 26.72 |
Vested |  | (137,165) |  |  | $ | 25.95 |
Unvested as of March 31, 2026 |  | 513,021 |  |  | $ | 28.97 |
The table below presents TB-PIUs activity under our share-based compensation plan for the three months ended March 31, 2026:
|  | Number of TB-PIUs |  | Weighted Average Grant Date Fair Value
Unvested as of December 31, 2025 |  | 235,903 |  |  | $ | 26.08 |
Granted |  | 74,215 |  |  | $ | 31.78 |
Vested |  | (96,694) |  |  | $ | 25.72 |
Unvested as of March 31, 2026 |  | 213,424 |  |  | $ | 28.23 |
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 presented 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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