Information by Business Segment (Details) - USD ($)
$ in Thousands |
3 Months Ended |
6 Months Ended |
|
Jun. 30, 2018 |
Jun. 30, 2017 |
Jun. 30, 2018 |
Jun. 30, 2017 |
Dec. 31, 2017 |
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
$ 129,162
|
$ 128,297
|
$ 257,440
|
$ 255,064
|
|
| Property operating expenses |
(49,446)
|
(48,628)
|
(100,397)
|
(97,147)
|
|
| UJV NOI allocable to COPT |
1,202
|
1,198
|
2,401
|
2,400
|
|
| NOI from real estate operations |
80,918
|
80,867
|
159,444
|
160,317
|
|
| Additions to long-lived assets |
16,768
|
15,155
|
31,063
|
32,195
|
|
| Transfers from non-operating properties |
34,224
|
46,742
|
54,318
|
59,387
|
|
| Segment assets |
3,612,362
|
3,592,304
|
3,612,362
|
3,592,304
|
$ 3,595,205
|
| Defense/Information Technology Locations |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
105,227
|
102,281
|
209,347
|
202,469
|
|
| Property operating expenses |
(38,241)
|
(37,571)
|
(76,704)
|
(74,584)
|
|
| UJV NOI allocable to COPT |
1,202
|
1,198
|
2,401
|
2,400
|
|
| NOI from real estate operations |
68,188
|
65,908
|
135,044
|
130,285
|
|
| Additions to long-lived assets |
11,138
|
9,161
|
21,386
|
17,351
|
|
| Transfers from non-operating properties |
33,091
|
46,767
|
52,173
|
59,386
|
|
| Defense/Information Technology Locations | Fort Meade/BW Corridor |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
61,993
|
61,284
|
124,775
|
122,139
|
|
| Property operating expenses |
(20,099)
|
(20,129)
|
(41,703)
|
(40,649)
|
|
| UJV NOI allocable to COPT |
0
|
0
|
0
|
0
|
|
| NOI from real estate operations |
41,894
|
41,155
|
83,072
|
81,490
|
|
| Additions to long-lived assets |
8,151
|
5,853
|
15,272
|
9,275
|
|
| Transfers from non-operating properties |
3,035
|
18,159
|
20,221
|
31,575
|
|
| Defense/Information Technology Locations | Northern Virginia Defense/IT |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
13,118
|
11,095
|
25,679
|
22,802
|
|
| Property operating expenses |
(4,909)
|
(4,219)
|
(9,632)
|
(8,671)
|
|
| UJV NOI allocable to COPT |
0
|
0
|
0
|
0
|
|
| NOI from real estate operations |
8,209
|
6,876
|
16,047
|
14,131
|
|
| Additions to long-lived assets |
1,186
|
977
|
3,126
|
3,445
|
|
| Transfers from non-operating properties |
352
|
218
|
693
|
440
|
|
| Defense/Information Technology Locations | Lackland Air Force Base |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
12,382
|
13,029
|
23,825
|
24,663
|
|
| Property operating expenses |
(7,494)
|
(8,130)
|
(14,092)
|
(14,932)
|
|
| UJV NOI allocable to COPT |
0
|
0
|
0
|
0
|
|
| NOI from real estate operations |
4,888
|
4,899
|
9,733
|
9,731
|
|
| Additions to long-lived assets |
0
|
16
|
0
|
16
|
|
| Transfers from non-operating properties |
0
|
0
|
0
|
0
|
|
| Defense/Information Technology Locations | Navy Support Locations |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
8,127
|
7,449
|
15,997
|
14,459
|
|
| Property operating expenses |
(3,431)
|
(3,025)
|
(6,735)
|
(6,234)
|
|
| UJV NOI allocable to COPT |
0
|
0
|
0
|
0
|
|
| NOI from real estate operations |
4,696
|
4,424
|
9,262
|
8,225
|
|
| Additions to long-lived assets |
1,450
|
2,231
|
2,558
|
4,399
|
|
| Transfers from non-operating properties |
3
|
466
|
0
|
466
|
|
| Defense/Information Technology Locations | Redstone Arsenal |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
3,652
|
3,624
|
7,285
|
7,084
|
|
| Property operating expenses |
(1,509)
|
(1,491)
|
(2,949)
|
(2,862)
|
|
| UJV NOI allocable to COPT |
0
|
0
|
0
|
0
|
|
| NOI from real estate operations |
2,143
|
2,133
|
4,336
|
4,222
|
|
| Additions to long-lived assets |
351
|
84
|
430
|
216
|
|
| Transfers from non-operating properties |
26
|
1,709
|
470
|
1,705
|
|
| Defense/Information Technology Locations | Data Center Shells |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
5,955
|
5,800
|
11,786
|
11,322
|
|
| Property operating expenses |
(799)
|
(577)
|
(1,593)
|
(1,236)
|
|
| UJV NOI allocable to COPT |
1,202
|
1,198
|
2,401
|
2,400
|
|
| NOI from real estate operations |
6,358
|
6,421
|
12,594
|
12,486
|
|
| Additions to long-lived assets |
0
|
0
|
0
|
0
|
|
| Transfers from non-operating properties |
29,675
|
26,215
|
30,789
|
25,200
|
|
| Regional Office |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
15,296
|
17,462
|
30,580
|
35,738
|
|
| Property operating expenses |
(7,169)
|
(7,082)
|
(15,047)
|
(14,568)
|
|
| UJV NOI allocable to COPT |
0
|
0
|
0
|
0
|
|
| NOI from real estate operations |
8,127
|
10,380
|
15,533
|
21,170
|
|
| Additions to long-lived assets |
5,361
|
4,018
|
9,245
|
11,138
|
|
| Transfers from non-operating properties |
0
|
(25)
|
0
|
(25)
|
|
| Operating wholesale data centers |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
8,105
|
7,033
|
16,182
|
13,803
|
|
| Property operating expenses |
(4,150)
|
(3,501)
|
(8,408)
|
(6,866)
|
|
| UJV NOI allocable to COPT |
0
|
0
|
0
|
0
|
|
| NOI from real estate operations |
3,955
|
3,532
|
7,774
|
6,937
|
|
| Additions to long-lived assets |
81
|
2,005
|
117
|
3,579
|
|
| Transfers from non-operating properties |
1,133
|
0
|
2,145
|
8
|
|
| Other Segments |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
534
|
1,521
|
1,331
|
3,054
|
|
| Property operating expenses |
114
|
(474)
|
(238)
|
(1,129)
|
|
| UJV NOI allocable to COPT |
0
|
0
|
0
|
0
|
|
| NOI from real estate operations |
648
|
1,047
|
1,093
|
1,925
|
|
| Additions to long-lived assets |
188
|
(29)
|
315
|
127
|
|
| Transfers from non-operating properties |
0
|
0
|
0
|
18
|
|
| Segment assets |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Segment assets |
3,042,452
|
2,993,078
|
3,042,452
|
2,993,078
|
|
| Segment assets | Defense/Information Technology Locations |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Segment assets |
2,420,153
|
2,309,105
|
2,420,153
|
2,309,105
|
|
| Segment assets | Defense/Information Technology Locations | Fort Meade/BW Corridor |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Segment assets |
1,269,525
|
1,267,635
|
1,269,525
|
1,267,635
|
|
| Segment assets | Defense/Information Technology Locations | Northern Virginia Defense/IT |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Segment assets |
396,139
|
357,747
|
396,139
|
357,747
|
|
| Segment assets | Defense/Information Technology Locations | Lackland Air Force Base |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Segment assets |
126,956
|
130,431
|
126,956
|
130,431
|
|
| Segment assets | Defense/Information Technology Locations | Navy Support Locations |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Segment assets |
190,537
|
195,732
|
190,537
|
195,732
|
|
| Segment assets | Defense/Information Technology Locations | Redstone Arsenal |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Segment assets |
106,374
|
109,586
|
106,374
|
109,586
|
|
| Segment assets | Defense/Information Technology Locations | Data Center Shells |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Segment assets |
330,622
|
247,974
|
330,622
|
247,974
|
|
| Segment assets | Regional Office |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Segment assets |
396,847
|
435,399
|
396,847
|
435,399
|
|
| Segment assets | Operating wholesale data centers |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Segment assets |
221,239
|
229,224
|
221,239
|
229,224
|
|
| Segment assets | Other Segments |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Segment assets |
$ 4,213
|
$ 19,350
|
$ 4,213
|
$ 19,350
|
|