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Information by Business Segment (Details 2) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Reconciliation of segment revenues to total revenues |  |  |  |  |  |  |  |  |  |  |
Segment revenues from real estate operations |  |  |  |  |  |  |  |  | $ 509,980 | $ 525,964 | $ 519,068
Construction contract and other service revenues |  |  |  |  |  |  |  |  | 102,840 | 48,364 | 106,402
Less: Revenues from discontinued operations |  |  |  |  |  |  |  |  | 0 | 0 | (4)
Total revenues | $ 164,567 | $ 157,017 | $ 151,435 | $ 139,801 | $ 141,991 | $ 142,103 | $ 145,927 | $ 144,307 | 612,820 | 574,328 | 625,466
Reconciliation of segment property operating expenses to property operating expenses |  |  |  |  |  |  |  |  |  |  |
Segment property operating expenses |  |  |  |  |  |  |  |  | 190,964 | 197,530 | 194,488
Less: Property operating expenses from discontinued operations |  |  |  |  |  |  |  |  | 0 | 0 | 6
Total property operating expenses |  |  |  |  |  |  |  |  | 190,964 | 197,530 | 194,494
Reconciliation of Operatiing Income from Unconsolidated Joint Ventures to Equity Method Investments [Abstract] |  |  |  |  |  |  |  |  |  |  |
UJV NOI allocable to COPT |  |  |  |  |  |  |  |  | 5,188 | 2,305 | 0
Less: Income from UJV allocable to COPT attributable to depreciation and amortization expense and interest expense |  |  |  |  |  |  |  |  | (2,301) | (993) | 0
Add: Equity in (loss) income of unconsolidated non-real estate entities |  |  |  |  |  |  |  |  | (5) | 20 | 62
Equity in income of unconsolidated entities |  |  |  |  |  |  |  |  | 2,882 | 1,332 | 62
Computation of net operating income from service operations |  |  |  |  |  |  |  |  |  |  |
Construction contract and other service revenues |  |  |  |  |  |  |  |  | 102,840 | 48,364 | 106,402
Construction contract and other service expenses |  |  |  |  |  |  |  |  | (99,618) | (45,481) | (102,696)
NOI from service operations |  |  |  |  |  |  |  |  | $ 3,222 | $ 2,883 | $ 3,706

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- Definition The aggregate costs related to construction and development services and the aggregate costs related to other service operations during the reporting period + References No definition available. + Details
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- Definition Amount of property operating expenses attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period. + References No definition available. + Details
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- Definition Costs incurred and are directly related to generating revenues from leased and rented property or equipment for the reportable segment. + References No definition available. + Details
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- Definition The aggregate revenue from real estate operations during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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