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Information by Business Segment (NOI Reconciliation) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Segment financial information for real estate operations |  |  |
Depreciation and other amortization associated with real estate operations | $ (141,230) | $ (137,543) | $ (126,503)
General, administrative and leasing expenses | (35,798) | (36,127) | (33,001)
Business development expenses and land carry costs | (3,193) | (4,647) | (4,473)
Impairment losses | 0 | 0 | (1,530)
Interest expense | (61,174) | (65,398) | (67,937)
Interest and other income | 9,341 | 7,879 | 8,574
Credit loss (expense) recoveries | (271) | 1,128 | 933
Gain on sales of real estate | 19,250 | 65,590 | 30,209
Gain on sale of investment in unconsolidated real estate joint venture | 0 | 0 | 29,416
Loss on early extinguishment of debt | (609) | (100,626) | (7,306)
Loss on interest rate derivatives | 0 | 0 | (53,196)
Equity in income of unconsolidated entities | 1,743 | 1,093 | 1,825
UJV NOI allocable to COPT included in equity in income of unconsolidated entities | (4,327) | (4,029) | (6,951)
Income tax expense | (447) | (145) | (353)
Revenues from real estate operations from discontinued operations (Note 4) | (1,980) | (30,490) | (27,011)
Property operating expenses from discontinued operations (Note 4) | 971 | 16,842 | 13,044
Income from continuing operations | 149,249 | 78,220 | 100,601
Real estate operations |  |  |
Segment financial information for real estate operations |  |  |
NOI from real estate operations | 362,304 | 360,870 | 341,836
UJV NOI allocable to COPT included in equity in income of unconsolidated entities | (4,327) | (4,029) | (6,951)
Property operating expenses from discontinued operations (Note 4) | 971 | 16,842 | 13,044
Service operations |  |  |
Segment financial information for real estate operations |  |  |
NOI from service operations | $ 4,669 | $ 3,823 | $ 3,025

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- Definition Costs incurred for business development, which involves the development of products and services, their delivery, design and their implementation. Business development includes a number of techniques designed to grow an economic enterprise. It includes the non capitalized cost of evaluating and executing acquisitions. It also includes expenses incurred in connection with properties not in operations. + References No definition available. + Details
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- Definition The current period expense charged against earnings on long-lived, physical real estate operations assets, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset or deferred costs associated with real estate operations over the benefit period of such asset or costs; or to reflect consumption during the period of an asset that is not used in production. + References No definition available. + Details
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