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Information by Business Segment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment financial information for real estate operations |  |  |
Revenues from real estate operations | $ 509,980 | $ 525,964 | $ 519,068
Property operating expenses | (190,964) | (197,530) | (194,488)
UJV NOI allocable to COPT | 5,188 | 2,305 | 0
NOI from real estate operations | 324,204 | 330,739 | 324,580
Additions to long-lived assets | 73,341 | 70,324 | 335,269
Transfers from non-operating properties | 202,211 | 184,640 | 307,120
Segment assets | 3,578,484 | 3,780,885 |
Defense/Information Technology Sector [Member] |  |  |
Segment financial information for real estate operations |  |  |
Revenues from real estate operations | 408,122 | 406,210 | 394,283
Property operating expenses | (146,558) | (148,705) | (144,444)
UJV NOI allocable to COPT | 5,188 | 2,305 |
NOI from real estate operations | 266,752 | 259,810 | 249,839
Additions to long-lived assets | 44,352 | 57,131 | 130,670
Transfers from non-operating properties | 202,185 | 184,943 | 194,647
Defense/Information Technology Sector [Member] | Fort Meade/BW Corridor [Member] |  |  |
Segment financial information for real estate operations |  |  |
Revenues from real estate operations | 245,613 | 245,354 | 244,274
Property operating expenses | (80,697) | (83,684) | (83,309)
UJV NOI allocable to COPT | 0 | 0 |
NOI from real estate operations | 164,916 | 161,670 | 160,965
Additions to long-lived assets | 26,659 | 26,267 | 31,883
Transfers from non-operating properties | 43,370 | 49,937 | 45,560
Defense/Information Technology Sector [Member] | Northern Virginia Defense/IT [Member] |  |  |
Segment financial information for real estate operations |  |  |
Revenues from real estate operations | 47,118 | 48,964 | 49,199
Property operating expenses | (16,938) | (17,824) | (20,107)
UJV NOI allocable to COPT | 0 | 0 |
NOI from real estate operations | 30,180 | 31,140 | 29,092
Additions to long-lived assets | 8,115 | 17,344 | 90,248
Transfers from non-operating properties | 48,328 | 28,230 | 50,690
Defense/Information Technology Sector [Member] | Lackland Air Force Base [Member] |  |  |
Segment financial information for real estate operations |  |  |
Revenues from real estate operations | 47,209 | 46,803 | 39,659
Property operating expenses | (27,812) | (27,357) | (22,004)
UJV NOI allocable to COPT | 0 | 0 |
NOI from real estate operations | 19,397 | 19,446 | 17,655
Additions to long-lived assets | 71 | 0 | 0
Transfers from non-operating properties | 0 | 240 | 32,307
Defense/Information Technology Sector [Member] | Navy Support Locations [Member] |  |  |
Segment financial information for real estate operations |  |  |
Revenues from real estate operations | 29,540 | 28,197 | 28,177
Property operating expenses | (12,619) | (12,690) | (13,229)
UJV NOI allocable to COPT | 0 | 0 |
NOI from real estate operations | 16,921 | 15,507 | 14,948
Additions to long-lived assets | 8,451 | 9,168 | 7,656
Transfers from non-operating properties | 474 | 0 | 1,408
Defense/Information Technology Sector [Member] | Redstone Arsenal [Member] |  |  |
Segment financial information for real estate operations |  |  |
Revenues from real estate operations | 14,322 | 13,056 | 11,228
Property operating expenses | (5,783) | (4,476) | (3,497)
UJV NOI allocable to COPT | 0 | 0 |
NOI from real estate operations | 8,539 | 8,580 | 7,731
Additions to long-lived assets | 1,056 | 4,352 | 883
Transfers from non-operating properties | 2,159 | 3,169 | 13,190
Defense/Information Technology Sector [Member] | Data Center Shells [Member] |  |  |
Segment financial information for real estate operations |  |  |
Revenues from real estate operations | 24,320 | 23,836 | 21,746
Property operating expenses | (2,709) | (2,674) | (2,298)
UJV NOI allocable to COPT | 5,188 | 2,305 |
NOI from real estate operations | 26,799 | 23,467 | 19,448
Additions to long-lived assets | 0 | 0 | 0
Transfers from non-operating properties | 107,854 | 103,367 | 51,492
Regional Office [Member] |  |  |
Segment financial information for real estate operations |  |  |
Revenues from real estate operations | 68,262 | 85,805 | 98,165
Property operating expenses | (28,982) | (34,095) | (36,165)
UJV NOI allocable to COPT | 0 | 0 |
NOI from real estate operations | 39,280 | 51,710 | 62,000
Additions to long-lived assets | 25,299 | 12,559 | 204,139
Transfers from non-operating properties | 0 | 82 | 22,313
Operating wholesale data centers [Member] |  |  |
Segment financial information for real estate operations |  |  |
Revenues from real estate operations | 28,875 | 26,869 | 19,032
Property operating expenses | (13,551) | (11,512) | (10,402)
UJV NOI allocable to COPT | 0 | 0 |
NOI from real estate operations | 15,324 | 15,357 | 8,630
Additions to long-lived assets | 3,580 | 299 | 132
Transfers from non-operating properties | 8 | (377) | 89,745
Other [Member] |  |  |
Segment financial information for real estate operations |  |  |
Revenues from real estate operations | 4,721 | 7,080 | 7,588
Property operating expenses | (1,873) | (3,218) | (3,477)
UJV NOI allocable to COPT | 0 | 0 |
NOI from real estate operations | 2,848 | 3,862 | 4,111
Additions to long-lived assets | 110 | 335 | 328
Transfers from non-operating properties | 18 | (8) | 415
Segment assets [Member] |  |  |
Segment financial information for real estate operations |  |  |
Segment assets | 3,011,284 | 3,004,247 | 3,265,469
Segment assets [Member] | Defense/Information Technology Sector [Member] |  |  |
Segment financial information for real estate operations |  |  |
Segment assets | 2,382,268 | 2,308,189 | 2,342,746
Segment assets [Member] | Defense/Information Technology Sector [Member] | Fort Meade/BW Corridor [Member] |  |  |
Segment financial information for real estate operations |  |  |
Segment assets | 1,263,567 | 1,255,230 | 1,290,028
Segment assets [Member] | Defense/Information Technology Sector [Member] | Northern Virginia Defense/IT [Member] |  |  |
Segment financial information for real estate operations |  |  |
Segment assets | 402,076 | 404,438 | 411,196
Segment assets [Member] | Defense/Information Technology Sector [Member] | Lackland Air Force Base [Member] |  |  |
Segment financial information for real estate operations |  |  |
Segment assets | 128,755 | 131,957 | 134,381
Segment assets [Member] | Defense/Information Technology Sector [Member] | Navy Support Locations [Member] |  |  |
Segment financial information for real estate operations |  |  |
Segment assets | 194,476 | 196,486 | 196,090
Segment assets [Member] | Defense/Information Technology Sector [Member] | Redstone Arsenal [Member] |  |  |
Segment financial information for real estate operations |  |  |
Segment assets | 108,119 | 110,395 | 108,038
Segment assets [Member] | Defense/Information Technology Sector [Member] | Data Center Shells [Member] |  |  |
Segment financial information for real estate operations |  |  |
Segment assets | 285,275 | 209,683 | 203,013
Segment assets [Member] | Regional Office [Member] |  |  |
Segment financial information for real estate operations |  |  |
Segment assets | 400,512 | 442,811 | 608,471
Segment assets [Member] | Operating wholesale data centers [Member] |  |  |
Segment financial information for real estate operations |  |  |
Segment assets | 224,422 | 231,954 | 243,338
Segment assets [Member] | Other [Member] |  |  |
Segment financial information for real estate operations |  |  |
Segment assets | $ 4,082 | $ 21,293 | $ 70,914

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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 acquisition of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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