COPT Defense Properties Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Assets and Liabilities, Measured on Recurring Basis (Details)

Fair Value Measurements - Assets and Liabilities, Measured on Recurring Basis (Details) - Fair value measurement on a recurring basis $ in Thousands	Mar. 31, 2023 USD ($)
Assets:
Interest rate derivatives	$ 2,179
Total assets	4,054
Liabilities:
Deferred compensation plan liability	1,875
Interest rate derivatives	355
Total liabilities	2,230
Mutual funds
Assets:
Marketable securities in deferred compensation plan	1,831
Other
Assets:
Marketable securities in deferred compensation plan	44
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Interest rate derivatives	0
Total assets	1,875
Liabilities:
Deferred compensation plan liability	0
Interest rate derivatives	0
Total liabilities	0
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Mutual funds
Assets:
Marketable securities in deferred compensation plan	1,831
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Other
Assets:
Marketable securities in deferred compensation plan	44
Significant Other Observable Inputs (Level 2)
Assets:
Interest rate derivatives	2,179
Total assets	2,179
Liabilities:
Deferred compensation plan liability	1,875
Interest rate derivatives	355
Total liabilities	2,230
Significant Other Observable Inputs (Level 2) \| Mutual funds
Assets:
Marketable securities in deferred compensation plan	0
Significant Other Observable Inputs (Level 2) \| Other
Assets:
Marketable securities in deferred compensation plan	0
Significant Unobservable Inputs (Level 3)
Assets:
Interest rate derivatives	0
Total assets	0
Liabilities:
Deferred compensation plan liability	0
Interest rate derivatives	0
Total liabilities	0
Significant Unobservable Inputs (Level 3) \| Mutual funds
Assets:
Marketable securities in deferred compensation plan	0
Significant Unobservable Inputs (Level 3) \| Other
Assets:
Marketable securities in deferred compensation plan	$ 0