Information by Business Segment (Details) - USD ($)
$ in Thousands |
3 Months Ended |
9 Months Ended |
|
Sep. 30, 2018 |
Sep. 30, 2017 |
Sep. 30, 2018 |
Sep. 30, 2017 |
Dec. 31, 2017 |
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
$ 137,411
|
$ 157,017
|
$ 439,630
|
$ 448,253
|
|
| Property operating expenses |
(49,340)
|
(46,368)
|
(149,737)
|
(143,515)
|
|
| UJV NOI allocable to COPT |
1,206
|
1,202
|
3,607
|
3,602
|
|
| Operating income |
37,352
|
38,939
|
111,547
|
110,990
|
|
| Segment assets |
3,650,366
|
3,576,841
|
3,650,366
|
3,576,841
|
$ 3,595,205
|
| Real estate operations |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
128,988
|
127,231
|
386,428
|
382,295
|
|
| Property operating expenses |
(49,340)
|
(46,368)
|
(149,737)
|
(143,515)
|
|
| UJV NOI allocable to COPT |
1,206
|
1,202
|
3,607
|
3,602
|
|
| Operating income |
80,854
|
82,065
|
240,298
|
242,382
|
|
| Additions to long-lived assets |
21,259
|
16,628
|
52,322
|
48,823
|
|
| Transfers from non-operating properties |
46,685
|
80,847
|
101,003
|
140,234
|
|
| Defense/Information Technology Locations | Real estate operations |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
104,932
|
102,170
|
314,279
|
304,639
|
|
| Property operating expenses |
(37,148)
|
(35,470)
|
(113,852)
|
(110,054)
|
|
| UJV NOI allocable to COPT |
1,206
|
1,202
|
3,607
|
3,602
|
|
| Operating income |
68,990
|
67,902
|
204,034
|
198,187
|
|
| Additions to long-lived assets |
15,307
|
11,205
|
36,693
|
28,556
|
|
| Transfers from non-operating properties |
46,530
|
80,822
|
98,703
|
140,208
|
|
| Defense/Information Technology Locations | Fort Meade/BW Corridor | Real estate operations |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
61,396
|
61,254
|
186,171
|
183,393
|
|
| Property operating expenses |
(19,847)
|
(19,708)
|
(61,550)
|
(60,357)
|
|
| UJV NOI allocable to COPT |
0
|
0
|
0
|
0
|
|
| Operating income |
41,549
|
41,546
|
124,621
|
123,036
|
|
| Additions to long-lived assets |
11,211
|
5,810
|
26,483
|
15,085
|
|
| Transfers from non-operating properties |
14,698
|
5,519
|
34,919
|
37,094
|
|
| Defense/Information Technology Locations | Northern Virginia Defense/IT | Real estate operations |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
13,960
|
12,190
|
39,639
|
34,992
|
|
| Property operating expenses |
(5,518)
|
(4,343)
|
(15,150)
|
(13,014)
|
|
| UJV NOI allocable to COPT |
0
|
0
|
0
|
0
|
|
| Operating income |
8,442
|
7,847
|
24,489
|
21,978
|
|
| Additions to long-lived assets |
2,305
|
2,587
|
5,431
|
6,032
|
|
| Transfers from non-operating properties |
1,550
|
45,554
|
2,243
|
45,994
|
|
| Defense/Information Technology Locations | Lackland Air Force Base | Real estate operations |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
11,254
|
11,024
|
35,079
|
35,687
|
|
| Property operating expenses |
(6,432)
|
(6,193)
|
(20,524)
|
(21,125)
|
|
| UJV NOI allocable to COPT |
0
|
0
|
0
|
0
|
|
| Operating income |
4,822
|
4,831
|
14,555
|
14,562
|
|
| Additions to long-lived assets |
0
|
55
|
0
|
71
|
|
| Transfers from non-operating properties |
0
|
0
|
0
|
0
|
|
| Defense/Information Technology Locations | Navy Support Locations | Real estate operations |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
7,899
|
7,494
|
23,896
|
21,953
|
|
| Property operating expenses |
(3,208)
|
(3,157)
|
(9,943)
|
(9,391)
|
|
| UJV NOI allocable to COPT |
0
|
0
|
0
|
0
|
|
| Operating income |
4,691
|
4,337
|
13,953
|
12,562
|
|
| Additions to long-lived assets |
1,758
|
1,910
|
4,316
|
6,309
|
|
| Transfers from non-operating properties |
(17)
|
8
|
(17)
|
474
|
|
| Defense/Information Technology Locations | Redstone Arsenal | Real estate operations |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
3,734
|
3,532
|
11,019
|
10,616
|
|
| Property operating expenses |
(1,569)
|
(1,432)
|
(4,518)
|
(4,294)
|
|
| UJV NOI allocable to COPT |
0
|
0
|
0
|
0
|
|
| Operating income |
2,165
|
2,100
|
6,501
|
6,322
|
|
| Additions to long-lived assets |
33
|
843
|
463
|
1,059
|
|
| Transfers from non-operating properties |
13
|
(62)
|
483
|
1,643
|
|
| Defense/Information Technology Locations | Data Center Shells | Real estate operations |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
6,689
|
6,676
|
18,475
|
17,998
|
|
| Property operating expenses |
(574)
|
(637)
|
(2,167)
|
(1,873)
|
|
| UJV NOI allocable to COPT |
1,206
|
1,202
|
3,607
|
3,602
|
|
| Operating income |
7,321
|
7,241
|
19,915
|
19,727
|
|
| Additions to long-lived assets |
0
|
0
|
0
|
0
|
|
| Transfers from non-operating properties |
30,286
|
29,803
|
61,075
|
55,003
|
|
| Regional Office | Real estate operations |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
15,272
|
16,656
|
45,852
|
52,394
|
|
| Property operating expenses |
(7,425)
|
(7,406)
|
(22,472)
|
(21,974)
|
|
| UJV NOI allocable to COPT |
0
|
0
|
0
|
0
|
|
| Operating income |
7,847
|
9,250
|
23,380
|
30,420
|
|
| Additions to long-lived assets |
5,670
|
5,338
|
14,915
|
16,476
|
|
| Transfers from non-operating properties |
0
|
25
|
0
|
0
|
|
| Operating wholesale data centers | Real estate operations |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
7,781
|
7,398
|
23,963
|
21,201
|
|
| Property operating expenses |
(3,965)
|
(3,175)
|
(12,373)
|
(10,041)
|
|
| UJV NOI allocable to COPT |
0
|
0
|
0
|
0
|
|
| Operating income |
3,816
|
4,223
|
11,590
|
11,160
|
|
| Additions to long-lived assets |
370
|
9
|
487
|
3,588
|
|
| Transfers from non-operating properties |
155
|
0
|
2,300
|
8
|
|
| Other Segments | Real estate operations |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
1,003
|
1,007
|
2,334
|
4,061
|
|
| Property operating expenses |
(802)
|
(317)
|
(1,040)
|
(1,446)
|
|
| UJV NOI allocable to COPT |
0
|
0
|
0
|
0
|
|
| Operating income |
201
|
690
|
1,294
|
2,615
|
|
| Additions to long-lived assets |
(88)
|
76
|
227
|
203
|
|
| Transfers from non-operating properties |
0
|
0
|
0
|
18
|
|
| Segment assets |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Segment assets |
3,074,986
|
3,014,281
|
3,074,986
|
3,014,281
|
|
| Segment assets | Real estate operations |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Segment assets |
3,074,986
|
3,014,281
|
3,074,986
|
3,014,281
|
|
| Segment assets | Defense/Information Technology Locations | Real estate operations |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Segment assets |
2,455,324
|
2,375,446
|
2,455,324
|
2,375,446
|
|
| Segment assets | Defense/Information Technology Locations | Fort Meade/BW Corridor | Real estate operations |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Segment assets |
1,280,837
|
1,265,569
|
1,280,837
|
1,265,569
|
|
| Segment assets | Defense/Information Technology Locations | Northern Virginia Defense/IT | Real estate operations |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Segment assets |
394,066
|
400,855
|
394,066
|
400,855
|
|
| Segment assets | Defense/Information Technology Locations | Lackland Air Force Base | Real estate operations |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Segment assets |
126,047
|
129,657
|
126,047
|
129,657
|
|
| Segment assets | Defense/Information Technology Locations | Navy Support Locations | Real estate operations |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Segment assets |
189,406
|
194,801
|
189,406
|
194,801
|
|
| Segment assets | Defense/Information Technology Locations | Redstone Arsenal | Real estate operations |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Segment assets |
105,315
|
108,884
|
105,315
|
108,884
|
|
| Segment assets | Defense/Information Technology Locations | Data Center Shells | Real estate operations |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Segment assets |
359,653
|
275,680
|
359,653
|
275,680
|
|
| Segment assets | Regional Office | Real estate operations |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Segment assets |
396,624
|
398,579
|
396,624
|
398,579
|
|
| Segment assets | Operating wholesale data centers | Real estate operations |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Segment assets |
219,041
|
226,909
|
219,041
|
226,909
|
|
| Segment assets | Other Segments | Real estate operations |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Segment assets |
$ 3,997
|
$ 13,347
|
$ 3,997
|
$ 13,347
|
|