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Information by Business Segment (Details) - 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
Segment financial information for real estate operations |  |  |  |  |  |  |  |  |  |  |
Revenues from real estate operations | $ 138,482 | $ 137,411 | $ 146,743 | $ 155,476 | $ 164,567 | $ 157,017 | $ 151,435 | $ 139,801 | $ 578,112 | $ 612,820 | $ 574,328
Property operating expenses |  |  |  |  |  |  |  |  | (201,035) | (190,964) | (197,530)
UJV NOI allocable to COPT |  |  |  |  |  |  |  |  | 4,818 | 4,805 | 2,145
Segment assets | 3,656,005 |  |  |  | 3,595,205 |  |  |  | 3,656,005 | 3,595,205 |
Segment assets [Member] |  |  |  |  |  |  |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |  |  |  |  |  |  |
Segment assets | 3,084,862 |  |  |  | 3,028,005 |  |  |  | 3,084,862 | 3,028,005 |
Real estate operations [Member] |  |  |  |  |  |  |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |  |  |  |  |  |  |
Revenues from real estate operations |  |  |  |  |  |  |  |  | 517,253 | 509,980 | 525,964
Property operating expenses |  |  |  |  |  |  |  |  | (201,035) | (190,964) | (197,530)
UJV NOI allocable to COPT |  |  |  |  |  |  |  |  | 4,818 | 4,805 | 2,145
NOI from real estate operations |  |  |  |  |  |  |  |  | 321,036 | 323,821 | 330,579
Additions to long-lived assets |  |  |  |  |  |  |  |  | 74,742 | 73,341 | 70,324
Transfers from non-operating properties |  |  |  |  |  |  |  |  | 166,143 | 202,211 | 184,640
Real estate operations [Member] | Defense/Information Technology Sector [Member] |  |  |  |  |  |  |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |  |  |  |  |  |  |
Revenues from real estate operations |  |  |  |  |  |  |  |  | 421,053 | 408,122 | 406,210
Property operating expenses |  |  |  |  |  |  |  |  | (153,004) | (146,558) | (148,705)
UJV NOI allocable to COPT |  |  |  |  |  |  |  |  | 4,818 | 4,805 | 2,145
NOI from real estate operations |  |  |  |  |  |  |  |  | 272,867 | 266,369 | 259,650
Additions to long-lived assets |  |  |  |  |  |  |  |  | 53,676 | 44,352 | 57,131
Transfers from non-operating properties |  |  |  |  |  |  |  |  | 163,839 | 202,185 | 184,943
Real estate operations [Member] | Defense/Information Technology Sector [Member] | Fort Meade/BW Corridor [Member] |  |  |  |  |  |  |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |  |  |  |  |  |  |
Revenues from real estate operations |  |  |  |  |  |  |  |  | 248,927 | 245,613 | 245,354
Property operating expenses |  |  |  |  |  |  |  |  | (82,975) | (80,697) | (83,684)
UJV NOI allocable to COPT |  |  |  |  |  |  |  |  | 0 | 0 | 0
NOI from real estate operations |  |  |  |  |  |  |  |  | 165,952 | 164,916 | 161,670
Additions to long-lived assets |  |  |  |  |  |  |  |  | 38,612 | 26,659 | 26,267
Transfers from non-operating properties |  |  |  |  |  |  |  |  | 35,648 | 43,370 | 49,937
Real estate operations [Member] | Defense/Information Technology Sector [Member] | Northern Virginia Defense/IT [Member] |  |  |  |  |  |  |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |  |  |  |  |  |  |
Revenues from real estate operations |  |  |  |  |  |  |  |  | 53,518 | 47,118 | 48,964
Property operating expenses |  |  |  |  |  |  |  |  | (20,330) | (16,938) | (17,824)
UJV NOI allocable to COPT |  |  |  |  |  |  |  |  | 0 | 0 | 0
NOI from real estate operations |  |  |  |  |  |  |  |  | 33,188 | 30,180 | 31,140
Additions to long-lived assets |  |  |  |  |  |  |  |  | 7,956 | 8,115 | 17,344
Transfers from non-operating properties |  |  |  |  |  |  |  |  | 10,231 | 48,328 | 28,230
Real estate operations [Member] | Defense/Information Technology Sector [Member] | Lackland Air Force Base [Member] |  |  |  |  |  |  |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |  |  |  |  |  |  |
Revenues from real estate operations |  |  |  |  |  |  |  |  | 46,286 | 47,209 | 46,803
Property operating expenses |  |  |  |  |  |  |  |  | (26,888) | (27,812) | (27,357)
UJV NOI allocable to COPT |  |  |  |  |  |  |  |  | 0 | 0 | 0
NOI from real estate operations |  |  |  |  |  |  |  |  | 19,398 | 19,397 | 19,446
Additions to long-lived assets |  |  |  |  |  |  |  |  | 0 | 71 | 0
Transfers from non-operating properties |  |  |  |  |  |  |  |  | 14,718 | 0 | 240
Real estate operations [Member] | Defense/Information Technology Sector [Member] | Navy Support Locations [Member] |  |  |  |  |  |  |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |  |  |  |  |  |  |
Revenues from real estate operations |  |  |  |  |  |  |  |  | 31,927 | 29,540 | 28,197
Property operating expenses |  |  |  |  |  |  |  |  | (13,536) | (12,619) | (12,690)
UJV NOI allocable to COPT |  |  |  |  |  |  |  |  | 0 | 0 | 0
NOI from real estate operations |  |  |  |  |  |  |  |  | 18,391 | 16,921 | 15,507
Additions to long-lived assets |  |  |  |  |  |  |  |  | 6,535 | 8,451 | 9,168
Transfers from non-operating properties |  |  |  |  |  |  |  |  | (116) | 474 | 0
Real estate operations [Member] | Defense/Information Technology Sector [Member] | Redstone Arsenal [Member] |  |  |  |  |  |  |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |  |  |  |  |  |  |
Revenues from real estate operations |  |  |  |  |  |  |  |  | 14,745 | 14,322 | 13,056
Property operating expenses |  |  |  |  |  |  |  |  | (6,050) | (5,783) | (4,476)
UJV NOI allocable to COPT |  |  |  |  |  |  |  |  | 0 | 0 | 0
NOI from real estate operations |  |  |  |  |  |  |  |  | 8,695 | 8,539 | 8,580
Additions to long-lived assets |  |  |  |  |  |  |  |  | 573 | 1,056 | 4,352
Transfers from non-operating properties |  |  |  |  |  |  |  |  | 4,167 | 2,159 | 3,169
Real estate operations [Member] | Defense/Information Technology Sector [Member] | Data Center Shells [Member] |  |  |  |  |  |  |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |  |  |  |  |  |  |
Revenues from real estate operations |  |  |  |  |  |  |  |  | 25,650 | 24,320 | 23,836
Property operating expenses |  |  |  |  |  |  |  |  | (3,225) | (2,709) | (2,674)
UJV NOI allocable to COPT |  |  |  |  |  |  |  |  | 4,818 | 4,805 | 2,145
NOI from real estate operations |  |  |  |  |  |  |  |  | 27,243 | 26,416 | 23,307
Additions to long-lived assets |  |  |  |  |  |  |  |  | 0 | 0 | 0
Transfers from non-operating properties |  |  |  |  |  |  |  |  | 99,191 | 107,854 | 103,367
Real estate operations [Member] | Regional Office [Member] |  |  |  |  |  |  |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |  |  |  |  |  |  |
Revenues from real estate operations |  |  |  |  |  |  |  |  | 61,181 | 68,262 | 85,805
Property operating expenses |  |  |  |  |  |  |  |  | (30,253) | (28,982) | (34,095)
UJV NOI allocable to COPT |  |  |  |  |  |  |  |  | 0 | 0 | 0
NOI from real estate operations |  |  |  |  |  |  |  |  | 30,928 | 39,280 | 51,710
Additions to long-lived assets |  |  |  |  |  |  |  |  | 19,730 | 25,299 | 12,559
Transfers from non-operating properties |  |  |  |  |  |  |  |  | 0 | 0 | 82
Real estate operations [Member] | Operating wholesale data centers [Member] |  |  |  |  |  |  |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |  |  |  |  |  |  |
Revenues from real estate operations |  |  |  |  |  |  |  |  | 31,892 | 28,875 | 26,869
Property operating expenses |  |  |  |  |  |  |  |  | (16,342) | (13,551) | (11,512)
UJV NOI allocable to COPT |  |  |  |  |  |  |  |  | 0 | 0 | 0
NOI from real estate operations |  |  |  |  |  |  |  |  | 15,550 | 15,324 | 15,357
Additions to long-lived assets |  |  |  |  |  |  |  |  | 856 | 3,580 | 299
Transfers from non-operating properties |  |  |  |  |  |  |  |  | 2,304 | 8 | (377)
Real estate operations [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |  |  |  |  |  |  |
Revenues from real estate operations |  |  |  |  |  |  |  |  | 3,127 | 4,721 | 7,080
Property operating expenses |  |  |  |  |  |  |  |  | (1,436) | (1,873) | (3,218)
UJV NOI allocable to COPT |  |  |  |  |  |  |  |  | 0 | 0 | 0
NOI from real estate operations |  |  |  |  |  |  |  |  | 1,691 | 2,848 | 3,862
Additions to long-lived assets |  |  |  |  |  |  |  |  | 480 | 110 | 335
Transfers from non-operating properties |  |  |  |  |  |  |  |  | 0 | 18 | (8)
Real estate operations [Member] | Segment assets [Member] |  |  |  |  |  |  |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |  |  |  |  |  |  |
Segment assets | 3,084,862 |  |  |  | 3,028,005 |  |  |  | 3,084,862 | 3,028,005 | 3,022,360
Real estate operations [Member] | Segment assets [Member] | Defense/Information Technology Sector [Member] |  |  |  |  |  |  |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |  |  |  |  |  |  |
Segment assets | 2,468,727 |  |  |  | 2,398,989 |  |  |  | 2,468,727 | 2,398,989 | 2,326,302
Real estate operations [Member] | Segment assets [Member] | Defense/Information Technology Sector [Member] | Fort Meade/BW Corridor [Member] |  |  |  |  |  |  |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |  |  |  |  |  |  |
Segment assets | 1,279,571 |  |  |  | 1,263,567 |  |  |  | 1,279,571 | 1,263,567 | 1,255,230
Real estate operations [Member] | Segment assets [Member] | Defense/Information Technology Sector [Member] | Northern Virginia Defense/IT [Member] |  |  |  |  |  |  |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |  |  |  |  |  |  |
Segment assets | 399,339 |  |  |  | 402,076 |  |  |  | 399,339 | 402,076 | 404,438
Real estate operations [Member] | Segment assets [Member] | Defense/Information Technology Sector [Member] | Lackland Air Force Base [Member] |  |  |  |  |  |  |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |  |  |  |  |  |  |
Segment assets | 139,731 |  |  |  | 128,755 |  |  |  | 139,731 | 128,755 | 131,957
Real estate operations [Member] | Segment assets [Member] | Defense/Information Technology Sector [Member] | Navy Support Locations [Member] |  |  |  |  |  |  |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |  |  |  |  |  |  |
Segment assets | 188,911 |  |  |  | 194,476 |  |  |  | 188,911 | 194,476 | 196,486
Real estate operations [Member] | Segment assets [Member] | Defense/Information Technology Sector [Member] | Redstone Arsenal [Member] |  |  |  |  |  |  |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |  |  |  |  |  |  |
Segment assets | 108,010 |  |  |  | 108,119 |  |  |  | 108,010 | 108,119 | 110,395
Real estate operations [Member] | Segment assets [Member] | Defense/Information Technology Sector [Member] | Data Center Shells [Member] |  |  |  |  |  |  |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |  |  |  |  |  |  |
Segment assets | 353,165 |  |  |  | 301,996 |  |  |  | 353,165 | 301,996 | 227,796
Real estate operations [Member] | Segment assets [Member] | Regional Office [Member] |  |  |  |  |  |  |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |  |  |  |  |  |  |
Segment assets | 395,380 |  |  |  | 400,512 |  |  |  | 395,380 | 400,512 | 442,811
Real estate operations [Member] | Segment assets [Member] | Operating wholesale data centers [Member] |  |  |  |  |  |  |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |  |  |  |  |  |  |
Segment assets | 216,640 |  |  |  | 224,422 |  |  |  | 216,640 | 224,422 | 231,954
Real estate operations [Member] | Segment assets [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |
Segment financial information for real estate operations |  |  |  |  |  |  |  |  |  |  |
Segment assets | $ 4,115 |  |  |  | $ 4,082 |  |  |  | $ 4,115 | $ 4,082 | $ 21,293

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