Information by Business Segment (Details)
$ in Thousands |
3 Months Ended |
6 Months Ended |
|
|
Jun. 30, 2015
USD ($)
segment
|
Jun. 30, 2014
USD ($)
|
Jun. 30, 2015
USD ($)
segment
|
Jun. 30, 2014
USD ($)
|
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 |
$ 128,195
|
$ 115,964
|
$ 250,905
|
$ 240,860
|
|
| Property operating expenses |
46,407
|
43,856
|
97,093
|
93,608
|
|
| NOI from real estate operations |
81,788
|
72,108
|
153,812
|
147,252
|
|
| Segment assets |
3,910,921
|
3,709,500
|
3,910,921
|
3,709,500
|
$ 3,670,257
|
| Operating Segment Total |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
128,195
|
115,964
|
250,905
|
240,860
|
|
| Property operating expenses |
46,407
|
43,856
|
97,093
|
93,608
|
|
| NOI from real estate operations |
81,788
|
72,108
|
153,812
|
147,252
|
|
| Additions to long-lived assets |
94,715
|
14,096
|
166,686
|
27,825
|
|
| Transfers from non-operating properties |
44,624
|
35,385
|
161,896
|
92,325
|
|
| Segment assets |
3,218,657
|
2,951,299
|
3,218,657
|
2,951,299
|
|
| Baltimore and Washington Corridor |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
60,611
|
57,456
|
122,403
|
118,569
|
|
| Property operating expenses |
19,539
|
19,348
|
43,122
|
42,945
|
|
| NOI from real estate operations |
41,072
|
38,108
|
79,281
|
75,624
|
|
| Additions to long-lived assets |
5,141
|
6,289
|
8,586
|
12,030
|
|
| Transfers from non-operating properties |
6,098
|
20,712
|
19,028
|
27,623
|
|
| Segment assets |
1,279,531
|
1,259,974
|
1,279,531
|
1,259,974
|
|
| Northern Virginia |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
24,393
|
20,898
|
46,142
|
45,866
|
|
| Property operating expenses |
8,687
|
7,651
|
17,808
|
16,624
|
|
| NOI from real estate operations |
15,706
|
13,247
|
28,334
|
29,242
|
|
| Additions to long-lived assets |
84,582
|
4,805
|
87,403
|
8,300
|
|
| Transfers from non-operating properties |
8,646
|
683
|
67,217
|
27,271
|
|
| Segment assets |
780,250
|
634,834
|
780,250
|
634,834
|
|
| San Antonio |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
10,204
|
8,758
|
19,375
|
17,237
|
|
| Property operating expenses |
5,615
|
4,817
|
10,590
|
9,291
|
|
| NOI from real estate operations |
4,589
|
3,941
|
8,785
|
7,946
|
|
| Additions to long-lived assets |
0
|
0
|
21
|
(6)
|
|
| Transfers from non-operating properties |
468
|
0
|
31,559
|
0
|
|
| Segment assets |
147,844
|
117,328
|
147,844
|
117,328
|
|
| Huntsville |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
2,658
|
2,404
|
5,104
|
4,959
|
|
| Property operating expenses |
888
|
859
|
1,717
|
1,512
|
|
| NOI from real estate operations |
1,770
|
1,545
|
3,387
|
3,447
|
|
| Additions to long-lived assets |
208
|
334
|
291
|
2,841
|
|
| Transfers from non-operating properties |
8,980
|
223
|
11,977
|
20,325
|
|
| Segment assets |
107,677
|
97,838
|
107,677
|
97,838
|
|
| Washington, DC - Capitol Riverfront |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
3,391
|
3,831
|
6,755
|
7,465
|
|
| Property operating expenses |
2,061
|
1,754
|
3,875
|
3,519
|
|
| NOI from real estate operations |
1,330
|
2,077
|
2,880
|
3,946
|
|
| Additions to long-lived assets |
806
|
478
|
1,199
|
541
|
|
| Transfers from non-operating properties |
0
|
0
|
0
|
0
|
|
| Segment assets |
94,099
|
97,136
|
94,099
|
97,136
|
|
| St. Mary's and King George Counties |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
3,795
|
4,202
|
7,696
|
8,518
|
|
| Property operating expenses |
1,329
|
1,289
|
2,913
|
2,793
|
|
| NOI from real estate operations |
2,466
|
2,913
|
4,783
|
5,725
|
|
| Additions to long-lived assets |
963
|
943
|
2,163
|
1,782
|
|
| Transfers from non-operating properties |
0
|
0
|
0
|
0
|
|
| Segment assets |
100,665
|
95,553
|
100,665
|
95,553
|
|
| Greater Baltimore |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
12,889
|
11,024
|
24,374
|
22,520
|
|
| Property operating expenses |
4,909
|
4,500
|
9,906
|
9,976
|
|
| NOI from real estate operations |
7,980
|
6,524
|
14,468
|
12,544
|
|
| Additions to long-lived assets |
2,476
|
1,242
|
66,080
|
2,254
|
|
| Transfers from non-operating properties |
12
|
2,953
|
12
|
3,027
|
|
| Segment assets |
332,973
|
300,139
|
332,973
|
300,139
|
|
| Greater Philadelphia |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
3,886
|
2,366
|
7,110
|
5,706
|
|
| Property operating expenses |
941
|
1,144
|
2,316
|
2,444
|
|
| NOI from real estate operations |
2,945
|
1,222
|
4,794
|
3,262
|
|
| Additions to long-lived assets |
284
|
88
|
578
|
99
|
|
| Transfers from non-operating properties |
5,218
|
10,198
|
16,716
|
13,374
|
|
| Segment assets |
123,112
|
104,436
|
123,112
|
104,436
|
|
| Other |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
2,548
|
2,533
|
5,091
|
5,127
|
|
| Property operating expenses |
217
|
613
|
413
|
935
|
|
| NOI from real estate operations |
2,331
|
1,920
|
4,678
|
4,192
|
|
| Additions to long-lived assets |
177
|
(93)
|
257
|
(38)
|
|
| Transfers from non-operating properties |
0
|
19
|
8
|
30
|
|
| Segment assets |
76,943
|
78,918
|
76,943
|
78,918
|
|
| Wholesale Data Center |
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
| Revenues from real estate operations |
3,820
|
2,492
|
6,855
|
4,893
|
|
| Property operating expenses |
2,221
|
1,881
|
4,433
|
3,569
|
|
| NOI from real estate operations |
1,599
|
611
|
2,422
|
1,324
|
|
| Additions to long-lived assets |
78
|
10
|
108
|
22
|
|
| Transfers from non-operating properties |
15,202
|
597
|
15,379
|
675
|
|
| Segment assets |
$ 175,563
|
$ 165,143
|
$ 175,563
|
$ 165,143
|
|