Information by Business Segment (Details) - USD ($)
$ in Thousands |
3 Months Ended |
9 Months Ended |
|
Sep. 30, 2017 |
Sep. 30, 2016 |
Sep. 30, 2017 |
Sep. 30, 2016 |
Dec. 31, 2016 |
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
$ 127,231
|
$ 130,954
|
$ 382,295
|
$ 397,965
|
|
| Property operating expenses |
(46,368)
|
(49,952)
|
(143,515)
|
(149,968)
|
|
| UJV NOI allocable to COPT |
1,297
|
1,008
|
3,889
|
1,008
|
|
| NOI from real estate operations |
82,160
|
82,010
|
242,669
|
249,005
|
|
| Additions to long-lived assets |
16,628
|
22,232
|
48,823
|
51,655
|
|
| Transfers from non-operating properties |
80,847
|
34,291
|
140,234
|
154,732
|
|
| Segment assets |
3,559,772
|
3,634,194
|
3,559,772
|
3,634,194
|
$ 3,780,885
|
| Defense/Information Technology Locations |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
102,170
|
101,819
|
304,639
|
305,146
|
|
| Property operating expenses |
(35,470)
|
(37,673)
|
(110,054)
|
(112,182)
|
|
| UJV NOI allocable to COPT |
1,297
|
1,008
|
3,889
|
1,008
|
|
| NOI from real estate operations |
67,997
|
65,154
|
198,474
|
193,972
|
|
| Additions to long-lived assets |
11,205
|
17,903
|
28,556
|
42,077
|
|
| Transfers from non-operating properties |
80,822
|
34,255
|
140,208
|
155,030
|
|
| Defense/Information Technology Locations | Fort Meade/BW Corridor |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
61,254
|
61,460
|
183,393
|
184,881
|
|
| Property operating expenses |
(19,708)
|
(20,598)
|
(60,357)
|
(64,222)
|
|
| UJV NOI allocable to COPT |
0
|
0
|
0
|
0
|
|
| NOI from real estate operations |
41,546
|
40,862
|
123,036
|
120,659
|
|
| Additions to long-lived assets |
5,810
|
5,901
|
15,085
|
19,516
|
|
| Transfers from non-operating properties |
5,519
|
5,331
|
37,094
|
41,850
|
|
| Defense/Information Technology Locations | Northern Virginia Defense/IT |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
12,190
|
12,231
|
34,992
|
36,404
|
|
| Property operating expenses |
(4,343)
|
(4,462)
|
(13,014)
|
(13,310)
|
|
| UJV NOI allocable to COPT |
0
|
0
|
0
|
0
|
|
| NOI from real estate operations |
7,847
|
7,769
|
21,978
|
23,094
|
|
| Additions to long-lived assets |
2,587
|
7,153
|
6,032
|
13,290
|
|
| Transfers from non-operating properties |
45,554
|
308
|
45,994
|
28,158
|
|
| Defense/Information Technology Locations | Lackland Air Force Base |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
11,024
|
12,532
|
35,687
|
34,408
|
|
| Property operating expenses |
(6,193)
|
(7,599)
|
(21,125)
|
(19,863)
|
|
| UJV NOI allocable to COPT |
0
|
0
|
0
|
0
|
|
| NOI from real estate operations |
4,831
|
4,933
|
14,562
|
14,545
|
|
| Additions to long-lived assets |
55
|
0
|
71
|
0
|
|
| Transfers from non-operating properties |
0
|
3
|
0
|
240
|
|
| Defense/Information Technology Locations | Navy Support Locations |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
7,494
|
7,232
|
21,953
|
21,164
|
|
| Property operating expenses |
(3,157)
|
(3,374)
|
(9,391)
|
(9,573)
|
|
| UJV NOI allocable to COPT |
0
|
0
|
0
|
0
|
|
| NOI from real estate operations |
4,337
|
3,858
|
12,562
|
11,591
|
|
| Additions to long-lived assets |
1,910
|
2,207
|
6,309
|
5,710
|
|
| Transfers from non-operating properties |
8
|
0
|
474
|
0
|
|
| Defense/Information Technology Locations | Redstone Arsenal |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
3,532
|
3,189
|
10,616
|
9,496
|
|
| Property operating expenses |
(1,432)
|
(1,112)
|
(4,294)
|
(3,050)
|
|
| UJV NOI allocable to COPT |
0
|
0
|
0
|
0
|
|
| NOI from real estate operations |
2,100
|
2,077
|
6,322
|
6,446
|
|
| Additions to long-lived assets |
843
|
2,642
|
1,059
|
3,561
|
|
| Transfers from non-operating properties |
(62)
|
3,100
|
1,643
|
3,315
|
|
| Defense/Information Technology Locations | Data Center Shells |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
6,676
|
5,175
|
17,998
|
18,793
|
|
| Property operating expenses |
(637)
|
(528)
|
(1,873)
|
(2,164)
|
|
| UJV NOI allocable to COPT |
1,297
|
1,008
|
3,889
|
1,008
|
|
| NOI from real estate operations |
7,336
|
5,655
|
20,014
|
17,637
|
|
| Additions to long-lived assets |
0
|
0
|
0
|
0
|
|
| Transfers from non-operating properties |
29,803
|
25,513
|
55,003
|
81,467
|
|
| Regional Office |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
16,656
|
20,499
|
52,394
|
67,284
|
|
| Property operating expenses |
(7,406)
|
(8,155)
|
(21,974)
|
(26,707)
|
|
| UJV NOI allocable to COPT |
0
|
0
|
0
|
0
|
|
| NOI from real estate operations |
9,250
|
12,344
|
30,420
|
40,577
|
|
| Additions to long-lived assets |
5,338
|
4,168
|
16,476
|
9,107
|
|
| Transfers from non-operating properties |
25
|
(4)
|
0
|
104
|
|
| Operating wholesale data centers |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
7,398
|
6,809
|
21,201
|
20,106
|
|
| Property operating expenses |
(3,175)
|
(3,317)
|
(10,041)
|
(8,629)
|
|
| UJV NOI allocable to COPT |
0
|
0
|
0
|
0
|
|
| NOI from real estate operations |
4,223
|
3,492
|
11,160
|
11,477
|
|
| Additions to long-lived assets |
9
|
108
|
3,588
|
108
|
|
| Transfers from non-operating properties |
0
|
40
|
8
|
(391)
|
|
| Other Segments |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
1,007
|
1,827
|
4,061
|
5,429
|
|
| Property operating expenses |
(317)
|
(807)
|
(1,446)
|
(2,450)
|
|
| UJV NOI allocable to COPT |
0
|
0
|
0
|
0
|
|
| NOI from real estate operations |
690
|
1,020
|
2,615
|
2,979
|
|
| Additions to long-lived assets |
76
|
53
|
203
|
363
|
|
| Transfers from non-operating properties |
0
|
0
|
18
|
(11)
|
|
| Segment assets |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Segment assets |
2,997,212
|
3,027,125
|
2,997,212
|
3,027,125
|
|
| Segment assets | Defense/Information Technology Locations |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Segment assets |
2,358,377
|
2,307,245
|
2,358,377
|
2,307,245
|
|
| Segment assets | Defense/Information Technology Locations | Fort Meade/BW Corridor |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Segment assets |
1,265,569
|
1,261,337
|
1,265,569
|
1,261,337
|
|
| Segment assets | Defense/Information Technology Locations | Northern Virginia Defense/IT |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Segment assets |
400,855
|
416,886
|
400,855
|
416,886
|
|
| Segment assets | Defense/Information Technology Locations | Lackland Air Force Base |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Segment assets |
129,657
|
132,722
|
129,657
|
132,722
|
|
| Segment assets | Defense/Information Technology Locations | Navy Support Locations |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Segment assets |
194,801
|
195,244
|
194,801
|
195,244
|
|
| Segment assets | Defense/Information Technology Locations | Redstone Arsenal |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Segment assets |
108,884
|
111,310
|
108,884
|
111,310
|
|
| Segment assets | Defense/Information Technology Locations | Data Center Shells |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Segment assets |
258,611
|
189,746
|
258,611
|
189,746
|
|
| Segment assets | Regional Office |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Segment assets |
398,579
|
453,766
|
398,579
|
453,766
|
|
| Segment assets | Operating wholesale data centers |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Segment assets |
226,909
|
234,551
|
226,909
|
234,551
|
|
| Segment assets | Other Segments |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Segment assets |
$ 13,347
|
$ 31,563
|
$ 13,347
|
$ 31,563
|
|