COPT Defense Properties Quarterly report [Sections 13 or 15(d)]

Quarterly report [Sections 13 or 15(d)]

Debt, Net - Fair Value of Debt (Details)

Debt, Net - Fair Value of Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Carrying Amount
Carrying amount and estimated fair value of debt
Long-term debt	$ 2,443,518	$ 2,391,755
Carrying Amount \| Unsecured Senior Notes
Carrying amount and estimated fair value of debt
Long-term debt	2,126,062	2,122,270
Carrying Amount \| Other fixed-rate debt
Carrying amount and estimated fair value of debt
Long-term debt	36,445	37,381
Carrying Amount \| Variable-rate debt
Carrying amount and estimated fair value of debt
Long-term debt	281,011	232,104
Estimated Fair Value
Carrying amount and estimated fair value of debt
Long-term debt	2,343,015	2,215,514
Estimated Fair Value \| Unsecured Senior Notes
Carrying amount and estimated fair value of debt
Long-term debt	2,025,731	1,946,905
Estimated Fair Value \| Other fixed-rate debt
Carrying amount and estimated fair value of debt
Long-term debt	35,723	35,841
Estimated Fair Value \| Variable-rate debt
Carrying amount and estimated fair value of debt
Long-term debt	$ 281,561	$ 232,768

- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
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-Section 50
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-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
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-Section 50
-Paragraph 2
-Subparagraph (bbb)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Name Accounting Standards Codification
-Section 55
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-SubTopic 10
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482881/825-10-55-10

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 825
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-Section 50
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Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 825
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Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 825
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Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
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Reference 9: http://www.xbrl.org/2003/role/exampleRef
-Topic 825
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-Name Accounting Standards Codification
-Section 55
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482881/825-10-55-12

Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

+ Details