Information by Business Segment (Details)
$ in Thousands |
3 Months Ended |
9 Months Ended |
|
|
Sep. 30, 2015
USD ($)
segment
|
Sep. 30, 2014
USD ($)
|
Sep. 30, 2015
USD ($)
segment
|
Sep. 30, 2014
USD ($)
|
Dec. 31, 2014
USD ($)
|
| Segment Reporting [Abstract] |
|
|
|
|
|
| Number of primary office property segments | segment |
10
|
|
10
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
$ 133,686
|
$ 118,240
|
$ 384,591
|
$ 359,100
|
|
| Property operating expenses |
48,897
|
42,881
|
145,990
|
136,489
|
|
| NOI from real estate operations |
84,789
|
75,359
|
238,601
|
222,611
|
|
| Segment assets |
3,918,473
|
3,680,188
|
3,918,473
|
3,680,188
|
$ 3,670,257
|
| Operating Segment Total |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
133,686
|
118,240
|
384,591
|
359,100
|
|
| Property operating expenses |
48,897
|
42,881
|
145,990
|
136,489
|
|
| NOI from real estate operations |
84,789
|
75,359
|
238,601
|
222,611
|
|
| Additions to long-lived assets |
141,037
|
22,793
|
307,723
|
50,618
|
|
| Transfers from non-operating properties |
142,210
|
42,802
|
304,106
|
135,127
|
|
| Segment assets |
3,354,762
|
2,962,686
|
3,354,762
|
2,962,686
|
|
| Baltimore and Washington Corridor |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
62,009
|
58,883
|
184,412
|
177,452
|
|
| Property operating expenses |
20,169
|
19,457
|
63,291
|
62,402
|
|
| NOI from real estate operations |
41,840
|
39,426
|
121,121
|
115,050
|
|
| Additions to long-lived assets |
7,943
|
7,248
|
16,529
|
19,278
|
|
| Transfers from non-operating properties |
25,184
|
22,680
|
44,212
|
50,303
|
|
| Segment assets |
1,297,431
|
1,278,713
|
1,297,431
|
1,278,713
|
|
| Northern Virginia |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
23,332
|
21,369
|
69,474
|
67,235
|
|
| Property operating expenses |
7,785
|
7,500
|
25,593
|
24,124
|
|
| NOI from real estate operations |
15,547
|
13,869
|
43,881
|
43,111
|
|
| Additions to long-lived assets |
1,749
|
5,898
|
89,152
|
14,198
|
|
| Transfers from non-operating properties |
34,195
|
15,403
|
101,412
|
42,674
|
|
| Segment assets |
697,406
|
648,248
|
697,406
|
648,248
|
|
| San Antonio |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
9,492
|
9,031
|
28,867
|
26,268
|
|
| Property operating expenses |
4,808
|
5,100
|
15,398
|
14,391
|
|
| NOI from real estate operations |
4,684
|
3,931
|
13,469
|
11,877
|
|
| Additions to long-lived assets |
0
|
0
|
21
|
(6)
|
|
| Transfers from non-operating properties |
591
|
0
|
32,150
|
0
|
|
| Segment assets |
148,336
|
116,837
|
148,336
|
116,837
|
|
| Huntsville |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
3,061
|
2,471
|
8,165
|
7,430
|
|
| Property operating expenses |
888
|
763
|
2,605
|
2,275
|
|
| NOI from real estate operations |
2,173
|
1,708
|
5,560
|
5,155
|
|
| Additions to long-lived assets |
175
|
455
|
466
|
3,296
|
|
| Transfers from non-operating properties |
1,207
|
1,496
|
13,184
|
21,821
|
|
| Segment assets |
108,541
|
98,334
|
108,541
|
98,334
|
|
| Washington, DC - Capitol Riverfront |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
3,336
|
3,524
|
10,091
|
10,989
|
|
| Property operating expenses |
1,962
|
1,824
|
5,837
|
5,343
|
|
| NOI from real estate operations |
1,374
|
1,700
|
4,254
|
5,646
|
|
| Additions to long-lived assets |
1,098
|
458
|
2,297
|
999
|
|
| Transfers from non-operating properties |
0
|
0
|
0
|
0
|
|
| Segment assets |
94,120
|
96,131
|
94,120
|
96,131
|
|
| St. Mary's and King George Counties |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
3,550
|
4,158
|
11,246
|
12,676
|
|
| Property operating expenses |
1,325
|
1,277
|
4,238
|
4,070
|
|
| NOI from real estate operations |
2,225
|
2,881
|
7,008
|
8,606
|
|
| Additions to long-lived assets |
986
|
5,189
|
3,149
|
6,971
|
|
| Transfers from non-operating properties |
1,408
|
0
|
1,408
|
0
|
|
| Segment assets |
101,985
|
100,009
|
101,985
|
100,009
|
|
| Greater Baltimore |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
16,134
|
10,436
|
40,508
|
32,956
|
|
| Property operating expenses |
6,461
|
3,810
|
16,367
|
13,786
|
|
| NOI from real estate operations |
9,673
|
6,626
|
24,141
|
19,170
|
|
| Additions to long-lived assets |
128,933
|
3,021
|
195,013
|
5,275
|
|
| Transfers from non-operating properties |
315
|
495
|
327
|
3,522
|
|
| Segment assets |
455,469
|
274,931
|
455,469
|
274,931
|
|
| Greater Philadelphia |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
4,126
|
2,951
|
11,236
|
8,657
|
|
| Property operating expenses |
1,249
|
837
|
3,565
|
3,281
|
|
| NOI from real estate operations |
2,877
|
2,114
|
7,671
|
5,376
|
|
| Additions to long-lived assets |
246
|
625
|
824
|
724
|
|
| Transfers from non-operating properties |
5,506
|
2,506
|
22,222
|
15,880
|
|
| Segment assets |
128,409
|
107,051
|
128,409
|
107,051
|
|
| Other |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
2,568
|
2,541
|
7,659
|
7,668
|
|
| Property operating expenses |
242
|
260
|
655
|
1,195
|
|
| NOI from real estate operations |
2,326
|
2,281
|
7,004
|
6,473
|
|
| Additions to long-lived assets |
(93)
|
(125)
|
164
|
(163)
|
|
| Transfers from non-operating properties |
0
|
0
|
8
|
30
|
|
| Segment assets |
76,259
|
78,240
|
76,259
|
78,240
|
|
| Wholesale Data Center |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
6,078
|
2,876
|
12,933
|
7,769
|
|
| Property operating expenses |
4,008
|
2,053
|
8,441
|
5,622
|
|
| NOI from real estate operations |
2,070
|
823
|
4,492
|
2,147
|
|
| Additions to long-lived assets |
0
|
24
|
108
|
46
|
|
| Transfers from non-operating properties |
73,804
|
222
|
89,183
|
897
|
|
| Segment assets |
$ 246,806
|
$ 164,192
|
$ 246,806
|
$ 164,192
|
|