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Information by Business Segment (Details 2) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Reconciliation of segment revenues to total revenues |  |  |  |  |  |  |  |  |  |  |
Construction contract and other service revenues |  |  |  |  |  |  |  |  | $ 60,859 | $ 102,840 | $ 48,364
Total revenues | $ 138,482 | $ 137,411 | $ 146,743 | $ 155,476 | $ 164,567 | $ 157,017 | $ 151,435 | $ 139,801 | 578,112 | 612,820 | 574,328
Reconciliation of Operatiing Income from Unconsolidated Joint Ventures to Equity Method Investments [Abstract] |  |  |  |  |  |  |  |  |  |  |
UJV NOI allocable to COPT |  |  |  |  |  |  |  |  | 4,818 | 4,805 | 2,145
Less: Income from UJV allocable to COPT attributable to depreciation and amortization expense and interest expense |  |  |  |  |  |  |  |  | (3,314) | (3,310) | (1,413)
Add: Equity in income (loss) of unconsolidated non-real estate entities |  |  |  |  |  |  |  |  | 1,193 | (5) | 20
Equity in income of unconsolidated entities |  |  |  |  |  |  |  |  | 2,697 | 1,490 | 752
Computation of net operating income from service operations |  |  |  |  |  |  |  |  |  |  |
Construction contract and other service revenues |  |  |  |  |  |  |  |  | 60,859 | 102,840 | 48,364
Construction contract and other service expenses |  |  |  |  |  |  |  |  | (58,326) | (99,618) | (45,481)
Real estate operations [Member] |  |  |  |  |  |  |  |  |  |  |
Reconciliation of segment revenues to total revenues |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 517,253 | 509,980 | 525,964
Reconciliation of Operatiing Income from Unconsolidated Joint Ventures to Equity Method Investments [Abstract] |  |  |  |  |  |  |  |  |  |  |
UJV NOI allocable to COPT |  |  |  |  |  |  |  |  | 4,818 | 4,805 | 2,145
Service operations [Member] |  |  |  |  |  |  |  |  |  |  |
Computation of net operating income from service operations |  |  |  |  |  |  |  |  |  |  |
NOI from service operations |  |  |  |  |  |  |  |  | $ 2,533 | $ 3,222 | $ 2,883

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