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Summary of Significant Accounting Policies (Policies) | 9 Months Ended
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Sep. 30, 2025
Accounting Policies [Abstract] |
Basis of Presentation | Basis of Presentation These consolidated financial statements include the accounts of COPT Defense, the Operating Partnership, their subsidiaries and other entities in which COPT Defense has a majority voting interest and control. We also consolidate certain entities when control of such entities can be achieved through means other than voting rights (“variable interest entities” or “VIEs”) if we are deemed to be the primary beneficiary of such entities. We eliminate all intercompany balances and transactions in consolidation. We use the equity method of accounting when we own an interest in an entity and can exert significant influence over but cannot control the entity’s operations. We discontinue equity method accounting if our investment in an entity (and net advances) is reduced to zero unless we have guaranteed obligations of the entity or are otherwise committed to provide further financial support for the entity. When we own an equity investment in an entity and cannot exert significant influence over its operations, we measure the investment at fair value, with changes recognized through net income. For an investment without a readily determinable fair value, we measure the investment at cost, less any impairments, plus or minus changes resulting from observable price changes for an identical or similar investment of the same issuer. These interim financial statements should be read together with the consolidated financial statements and notes thereto as of and for the year ended December 31, 2024 included in our 2024 Annual Report on Form 10-K. The unaudited consolidated financial statements include all adjustments that are necessary, in the opinion of management, to fairly state our financial position and results of operations. All adjustments are of a normal recurring nature. The consolidated financial statements have been prepared using the accounting policies described in our 2024 Annual Report on Form 10-K.
Reclassifications | Reclassifications We reclassified certain amounts from prior periods to conform to the current period presentation of our consolidated financial statements with no effect on previously reported net income or equity.
Recent Accounting Pronouncements | Recent Accounting Pronouncements Effective January 1, 2025, we adopted guidance issued by the Financial Accounting Standards Board (“FASB”) aimed at reducing complexity and diversity in practice in determining whether a profits interest award is accounted for as a share-based payment. Our adoption of this guidance did not change the accounting for any of our share-based compensation award types, and therefore did not affect our consolidated financial statements. In December 2023, the FASB issued guidance to improve income tax disclosures. This guidance requires enhanced annual disclosures primarily related to existing rate reconciliation and income taxes paid disclosure requirements and is effective for us for our 2025 annual reporting. We expect to apply this guidance prospectively and do not expect it to materially affect our future related disclosures. In November 2024, the FASB issued guidance requiring disaggregated disclosure of specified information about certain expense categories included in expense line items on the consolidated statements of operations in the notes to the financial statements. This guidance is effective for us for annual periods beginning after December 15, 2026 and interim periods beginning after December 15, 2027. Early adoption is permitted. We expect to apply this guidance prospectively to financial statements issued for reporting periods after the effective date. We are currently assessing the application of this guidance on our future consolidated financial statements. In July 2025, the FASB issued guidance providing a practical expedient for use in estimating expected credit losses on non-lease revenue related accounts receivable and contract assets. The practical expedient permits an entity to assume that current conditions as of the balance sheet date do not change for the remaining life of the asset. The guidance is effective for us for interim and annual periods beginning after December 15, 2025. Early adoption is permitted and the guidance will be applied prospectively. We are currently assessing the application of this guidance on our future consolidated financial statements.

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- Definition Disclosure of accounting policy for basis of accounting, or basis of presentation, used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483426/235-10-50-4 + Details
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- Definition Disclosure of accounting policy pertaining to new accounting pronouncements that may impact the entity's financial reporting. Includes, but is not limited to, quantification of the expected or actual impact. + References No definition available. + Details
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- Definition Disclosure of accounting policy for reclassification affecting comparability of financial statement. Excludes amendment to accounting standards, other change in accounting principle, and correction of error. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 205 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483504/205-10-50-1 + Details
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