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Information by Business Segment (Details 2) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Reconciliation of segment revenues to total revenues |  |  |  |  |  |  |  |  |  |  |
Segment revenues from real estate operations |  |  |  |  |  |  |  |  | $ 525,964 | $ 519,068 | $ 479,711
Construction contract and other service revenues |  |  |  |  |  |  |  |  | 48,364 | 106,402 | 106,748
Less: Revenues from discontinued operations |  |  |  |  |  |  |  |  | 0 | (4) | 14
Total revenues | $ 141,991 | $ 142,103 | $ 145,927 | $ 144,307 | $ 143,325 | $ 150,744 | $ 170,363 | $ 161,034 | 574,328 | 625,466 | 586,473
Reconciliation of segment property operating expenses to property operating expenses |  |  |  |  |  |  |  |  |  |  |
Segment property operating expenses |  |  |  |  |  |  |  |  | 197,530 | 194,488 | 179,799
Less: Property operating expenses from discontinued operations |  |  |  |  |  |  |  |  | 0 | 6 | 135
Total property operating expenses |  |  |  |  |  |  |  |  | 197,530 | 194,494 | 179,934
Reconciliation of Operatiing Income from Unconsolidated Joint Ventures to Equity Method Investments [Abstract] |  |  |  |  |  |  |  |  |  |  |
UJV NOI allocable to COPT |  |  |  |  |  |  |  |  | (2,305) | 0 | 0
Less: Income from UJV allocable to COPT attributable to depreciation and amortization expense and interest expense |  |  |  |  |  |  |  |  | (993) | 0 | 0
Add: Equity in income of unconsolidated non-real estate entities |  |  |  |  |  |  |  |  | 20 | 62 | 229
Equity in income of unconsolidated entities |  |  |  |  |  |  |  |  | 1,332 | 62 | 229
Computation of net operating income from service operations |  |  |  |  |  |  |  |  |  |  |
Construction contract and other service revenues |  |  |  |  |  |  |  |  | 48,364 | 106,402 | 106,748
Construction contract and other service expenses |  |  |  |  |  |  |  |  | (45,481) | (102,696) | (100,058)
NOI from service operations |  |  |  |  |  |  |  |  | 2,883 | 3,706 | 6,690
Reconciliation of NOI from real estate operations and NOI from service operations to (loss) income from continuing operations |  |  |  |  |  |  |  |  |  |  |
NOI from real estate operations |  |  |  |  |  |  |  |  | 330,739 | 324,580 | 299,912
NOI from service operations |  |  |  |  |  |  |  |  | 2,883 | 3,706 | 6,690
Interest and other income |  |  |  |  |  |  |  |  | 5,444 | 4,517 | 4,923
Equity in income of unconsolidated entities |  |  |  |  |  |  |  |  | 1,332 | 62 | 229
Income tax expense |  |  |  |  |  |  |  |  | (244) | (199) | (310)
Impairment losses |  |  |  |  |  |  |  |  | (101,391) | (23,289) | (1,416)
General, administrative and leasing expenses |  |  |  |  |  |  |  |  | (36,553) | (31,361) | (31,794)
Business development expenses and land carry costs |  |  |  |  |  |  |  |  | (8,244) | (13,507) | (5,573)
Interest expense on continuing operations |  |  |  |  |  |  |  |  | (83,163) | (89,074) | (92,393)
NOI from discontinued operations |  |  |  |  |  |  |  |  | 0 | (10) | (121)
(Loss) gain on early extinguishment of debt |  |  |  |  |  |  |  |  | (1,110) | 85,275 | (9,552)
Depreciation and amortization associated with real estate operations |  |  |  |  |  |  |  |  | (132,719) | (140,025) | (136,086)
(Loss) income from continuing operations | $ 19,718 | $ (4,829) | $ (48,316) | $ 8,096 | $ (1,430) | $ 94,279 | $ 16,839 | $ 10,987 | $ (25,331) | $ 120,675 | $ 34,509

X
- 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 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 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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- 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 Income (Loss) from Equity Method Investments Allocable to Depreciation, Amortization and Interest Expense + References No definition available. + Details
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- Definition Represents the computation of NOI from service operations, which is the difference between Construction contract and other service revenues and Construction contract and other service expenses. + References No definition available. + Details
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- Definition Reconciliation of segment property operating expenses to property operating expenses [Abstract] + References No definition available. + Details
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- Definition Reconciliation of Operating Income from Unconsolidated Joint Ventures to Equity Method Investments [Abstract] + 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 Includes real estate revenues and property operating expenses from continuing and discontinued operations; and the net of revenues and property operating expenses of real estate operations owned through unconsolidated joint ventures allocable to parent. + References No definition available. + Details
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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629 + Details
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- Definition Amount after tax of income (loss) from continuing operations including portion attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=68079674&loc=SL4569616-111683 + Details
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- Definition This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. + 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(12)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(10)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66022249&loc=d3e33749-111570 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(13)(f)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + 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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