| Schedule of segment financial information for real estate operations | 
        
The table below reports segment financial information for our reportable segments (in thousands).  We measure the performance of our segments through the measure we define as NOI from real estate operations, which is derived by subtracting property operating expenses from revenues from real estate operations. 
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   | 
Operating Office Property Segments  | 
   | 
   | 
   | 
   | 
 
   | 
 Baltimore/ 
Washington 
Corridor 
 | 
   | 
 Northern 
Virginia 
 | 
   | 
 San 
Antonio 
 | 
   | 
Huntsville  | 
   | 
 Washington, 
DC - Capitol 
Riverfront 
 | 
   | 
 St. Mary’s &  
King George 
Counties 
 | 
   | 
 Greater 
Baltimore 
 | 
   | 
Greater Philadelphia  | 
   | 
 Colorado 
Springs 
 | 
   | 
Other  | 
   | 
 Operating 
Wholesale 
Data Center 
 | 
   | 
Total  | 
 
Three Months Ended June 30, 2014  | 
   | 
 
  | 
   | 
   | 
 
  | 
   | 
   | 
 
  | 
   | 
   | 
   | 
   | 
 
  | 
   | 
   | 
 
  | 
   | 
   | 
 
  | 
   | 
   | 
 
  | 
   | 
   | 
 
  | 
   | 
   | 
 
  | 
   | 
   | 
 
  | 
   | 
   | 
 
  | 
 
Revenues from real estate operations  | 
$  | 
57,456  | 
 
  | 
   | 
$  | 
20,898  | 
 
  | 
   | 
$  | 
8,758  | 
 
  | 
   | 
$  | 
2,404  | 
 
  | 
   | 
$  | 
3,831  | 
 
  | 
   | 
$  | 
4,202  | 
 
  | 
   | 
$  | 
11,024  | 
 
  | 
   | 
$  | 
2,366  | 
 
  | 
   | 
$  | 
(12  | 
)  | 
   | 
$  | 
2,545  | 
 
  | 
   | 
$  | 
2,492  | 
 
  | 
   | 
$  | 
115,964  | 
 
  | 
 
Property operating expenses  | 
19,348  | 
 
  | 
   | 
7,651  | 
 
  | 
   | 
4,817  | 
 
  | 
   | 
859  | 
 
  | 
   | 
1,754  | 
 
  | 
   | 
1,289  | 
 
  | 
   | 
4,500  | 
 
  | 
   | 
1,144  | 
 
  | 
   | 
11  | 
 
  | 
   | 
602  | 
 
  | 
   | 
1,881  | 
 
  | 
   | 
43,856  | 
 
  | 
 
NOI from real estate operations  | 
$  | 
38,108  | 
 
  | 
   | 
$  | 
13,247  | 
 
  | 
   | 
$  | 
3,941  | 
 
  | 
   | 
$  | 
1,545  | 
 
  | 
   | 
$  | 
2,077  | 
 
  | 
   | 
$  | 
2,913  | 
 
  | 
   | 
$  | 
6,524  | 
 
  | 
   | 
$  | 
1,222  | 
 
  | 
   | 
$  | 
(23  | 
)  | 
   | 
$  | 
1,943  | 
 
  | 
   | 
$  | 
611  | 
 
  | 
   | 
$  | 
72,108  | 
 
  | 
 
Additions to long-lived assets  | 
$  | 
6,289  | 
 
  | 
   | 
$  | 
4,805  | 
 
  | 
   | 
$  | 
—  | 
 
  | 
   | 
$  | 
334  | 
 
  | 
   | 
$  | 
478  | 
 
  | 
   | 
$  | 
943  | 
 
  | 
   | 
$  | 
1,242  | 
 
  | 
   | 
$  | 
88  | 
 
  | 
   | 
$  | 
—  | 
 
  | 
   | 
$  | 
(93  | 
)  | 
   | 
$  | 
10  | 
 
  | 
   | 
$  | 
14,096  | 
 
  | 
 
Transfers from non-operating properties  | 
$  | 
20,712  | 
 
  | 
   | 
$  | 
683  | 
 
  | 
   | 
$  | 
—  | 
 
  | 
   | 
$  | 
223  | 
 
  | 
   | 
$  | 
—  | 
 
  | 
   | 
$  | 
—  | 
 
  | 
   | 
$  | 
2,953  | 
 
  | 
   | 
$  | 
10,198  | 
 
  | 
   | 
$  | 
19  | 
 
  | 
   | 
$  | 
—  | 
 
  | 
   | 
$  | 
597  | 
 
  | 
   | 
$  | 
35,385  | 
 
  | 
 
Three Months Ended June 30, 2013  | 
   | 
 
  | 
   | 
   | 
 
  | 
   | 
   | 
 
  | 
   | 
—  | 
 
  | 
   | 
   | 
 
  | 
   | 
   | 
 
  | 
   | 
   | 
 
  | 
   | 
   | 
 
  | 
   | 
   | 
 
  | 
   | 
   | 
 
  | 
   | 
   | 
 
  | 
   | 
   | 
 
  | 
 
Revenues from real estate operations  | 
$  | 
59,640  | 
 
  | 
   | 
$  | 
22,988  | 
 
  | 
   | 
$  | 
8,364  | 
 
  | 
   | 
$  | 
1,359  | 
 
  | 
   | 
$  | 
4,177  | 
 
  | 
   | 
$  | 
4,093  | 
 
  | 
   | 
$  | 
10,824  | 
 
  | 
   | 
$  | 
2,784  | 
 
  | 
   | 
$  | 
6,469  | 
 
  | 
   | 
$  | 
2,560  | 
 
  | 
   | 
$  | 
2,017  | 
 
  | 
   | 
$  | 
125,275  | 
 
  | 
 
Property operating expenses  | 
19,728  | 
 
  | 
   | 
8,204  | 
 
  | 
   | 
4,478  | 
 
  | 
   | 
310  | 
 
  | 
   | 
1,874  | 
 
  | 
   | 
1,223  | 
 
  | 
   | 
4,097  | 
 
  | 
   | 
720  | 
 
  | 
   | 
2,185  | 
 
  | 
   | 
317  | 
 
  | 
   | 
1,518  | 
 
  | 
   | 
44,654  | 
 
  | 
 
NOI from real estate operations  | 
$  | 
39,912  | 
 
  | 
   | 
$  | 
14,784  | 
 
  | 
   | 
$  | 
3,886  | 
 
  | 
   | 
$  | 
1,049  | 
 
  | 
   | 
$  | 
2,303  | 
 
  | 
   | 
$  | 
2,870  | 
 
  | 
   | 
$  | 
6,727  | 
 
  | 
   | 
$  | 
2,064  | 
 
  | 
   | 
$  | 
4,284  | 
 
  | 
   | 
$  | 
2,243  | 
 
  | 
   | 
$  | 
499  | 
 
  | 
   | 
$  | 
80,621  | 
 
  | 
 
Additions to long-lived assets  | 
$  | 
4,120  | 
 
  | 
   | 
$  | 
2,696  | 
 
  | 
   | 
$  | 
7  | 
 
  | 
   | 
$  | 
3,497  | 
 
  | 
   | 
$  | 
241  | 
 
  | 
   | 
$  | 
729  | 
 
  | 
   | 
$  | 
(648  | 
)  | 
   | 
$  | 
285  | 
 
  | 
   | 
$  | 
595  | 
 
  | 
   | 
$  | 
84  | 
 
  | 
   | 
$  | 
176  | 
 
  | 
   | 
$  | 
11,782  | 
 
  | 
 
Transfers from non-operating properties  | 
$  | 
6,087  | 
 
  | 
   | 
$  | 
1,015  | 
 
  | 
   | 
$  | 
—  | 
 
  | 
   | 
$  | 
(3,283  | 
)  | 
   | 
$  | 
—  | 
 
  | 
   | 
$  | 
6  | 
 
  | 
   | 
$  | 
(9  | 
)  | 
   | 
$  | 
17,567  | 
 
  | 
   | 
$  | 
896  | 
 
  | 
   | 
$  | 
2  | 
 
  | 
   | 
$  | 
881  | 
 
  | 
   | 
$  | 
23,162  | 
 
  | 
 
Six Months Ended June 30, 2014  | 
   | 
 
  | 
   | 
   | 
 
  | 
   | 
   | 
 
  | 
   | 
   | 
   | 
   | 
 
  | 
   | 
   | 
 
  | 
   | 
   | 
 
  | 
   | 
   | 
 
  | 
   | 
   | 
 
  | 
   | 
   | 
 
  | 
   | 
   | 
 
  | 
   | 
   | 
 
  | 
 
Revenues from real estate operations  | 
$  | 
118,569  | 
 
  | 
   | 
$  | 
45,866  | 
 
  | 
   | 
$  | 
17,237  | 
 
  | 
   | 
$  | 
4,959  | 
 
  | 
   | 
$  | 
7,465  | 
 
  | 
   | 
$  | 
8,518  | 
 
  | 
   | 
$  | 
22,520  | 
 
  | 
   | 
$  | 
5,706  | 
 
  | 
   | 
$  | 
6  | 
 
  | 
   | 
$  | 
5,121  | 
 
  | 
   | 
$  | 
4,893  | 
 
  | 
   | 
$  | 
240,860  | 
 
  | 
 
Property operating expenses  | 
42,945  | 
 
  | 
   | 
16,624  | 
 
  | 
   | 
9,291  | 
 
  | 
   | 
1,512  | 
 
  | 
   | 
3,519  | 
 
  | 
   | 
2,793  | 
 
  | 
   | 
9,976  | 
 
  | 
   | 
2,444  | 
 
  | 
   | 
2  | 
 
  | 
   | 
933  | 
 
  | 
   | 
3,569  | 
 
  | 
   | 
93,608  | 
 
  | 
 
NOI from real estate operations  | 
$  | 
75,624  | 
 
  | 
   | 
$  | 
29,242  | 
 
  | 
   | 
$  | 
7,946  | 
 
  | 
   | 
$  | 
3,447  | 
 
  | 
   | 
$  | 
3,946  | 
 
  | 
   | 
$  | 
5,725  | 
 
  | 
   | 
$  | 
12,544  | 
 
  | 
   | 
$  | 
3,262  | 
 
  | 
   | 
$  | 
4  | 
 
  | 
   | 
$  | 
4,188  | 
 
  | 
   | 
$  | 
1,324  | 
 
  | 
   | 
$  | 
147,252  | 
 
  | 
 
Additions to long-lived assets  | 
$  | 
12,030  | 
 
  | 
   | 
$  | 
8,300  | 
 
  | 
   | 
$  | 
(6  | 
)  | 
   | 
$  | 
2,841  | 
 
  | 
   | 
$  | 
541  | 
 
  | 
   | 
$  | 
1,782  | 
 
  | 
   | 
$  | 
2,254  | 
 
  | 
   | 
$  | 
99  | 
 
  | 
   | 
$  | 
—  | 
 
  | 
   | 
$  | 
(38  | 
)  | 
   | 
$  | 
22  | 
 
  | 
   | 
$  | 
27,825  | 
 
  | 
 
Transfers from non-operating properties  | 
$  | 
27,623  | 
 
  | 
   | 
$  | 
27,271  | 
 
  | 
   | 
$  | 
—  | 
 
  | 
   | 
$  | 
20,325  | 
 
  | 
   | 
$  | 
—  | 
 
  | 
   | 
$  | 
—  | 
 
  | 
   | 
$  | 
3,027  | 
 
  | 
   | 
$  | 
13,374  | 
 
  | 
   | 
$  | 
30  | 
 
  | 
   | 
$  | 
—  | 
 
  | 
   | 
$  | 
675  | 
 
  | 
   | 
$  | 
92,325  | 
 
  | 
 
Segment assets at June 30, 2014  | 
$  | 
1,259,974  | 
 
  | 
   | 
$  | 
634,834  | 
 
  | 
   | 
$  | 
117,328  | 
 
  | 
   | 
$  | 
97,838  | 
 
  | 
   | 
$  | 
97,136  | 
 
  | 
   | 
$  | 
95,553  | 
 
  | 
   | 
$  | 
300,139  | 
 
  | 
   | 
$  | 
104,436  | 
 
  | 
   | 
$  | 
—  | 
 
  | 
   | 
$  | 
78,918  | 
 
  | 
   | 
$  | 
165,143  | 
 
  | 
   | 
$  | 
2,951,299  | 
 
  | 
 
Six Months Ended June 30, 2013  | 
   | 
 
  | 
   | 
   | 
 
  | 
   | 
   | 
 
  | 
   | 
   | 
   | 
   | 
 
  | 
   | 
   | 
 
  | 
   | 
   | 
 
  | 
   | 
   | 
 
  | 
   | 
   | 
 
  | 
   | 
   | 
 
  | 
   | 
   | 
 
  | 
   | 
   | 
 
  | 
 
Revenues from real estate operations  | 
$  | 
118,300  | 
 
  | 
   | 
$  | 
45,930  | 
 
  | 
   | 
$  | 
16,121  | 
 
  | 
   | 
$  | 
2,099  | 
 
  | 
   | 
$  | 
8,421  | 
 
  | 
   | 
$  | 
8,085  | 
 
  | 
   | 
$  | 
21,543  | 
 
  | 
   | 
$  | 
5,271  | 
 
  | 
   | 
$  | 
13,151  | 
 
  | 
   | 
$  | 
5,061  | 
 
  | 
   | 
$  | 
3,370  | 
 
  | 
   | 
$  | 
247,352  | 
 
  | 
 
Property operating expenses  | 
39,781  | 
 
  | 
   | 
16,021  | 
 
  | 
   | 
8,366  | 
 
  | 
   | 
492  | 
 
  | 
   | 
3,823  | 
 
  | 
   | 
2,416  | 
 
  | 
   | 
8,265  | 
 
  | 
   | 
1,558  | 
 
  | 
   | 
4,622  | 
 
  | 
   | 
542  | 
 
  | 
   | 
2,834  | 
 
  | 
   | 
88,720  | 
 
  | 
 
NOI from real estate operations  | 
$  | 
78,519  | 
 
  | 
   | 
$  | 
29,909  | 
 
  | 
   | 
$  | 
7,755  | 
 
  | 
   | 
$  | 
1,607  | 
 
  | 
   | 
$  | 
4,598  | 
 
  | 
   | 
$  | 
5,669  | 
 
  | 
   | 
$  | 
13,278  | 
 
  | 
   | 
$  | 
3,713  | 
 
  | 
   | 
$  | 
8,529  | 
 
  | 
   | 
$  | 
4,519  | 
 
  | 
   | 
$  | 
536  | 
 
  | 
   | 
$  | 
158,632  | 
 
  | 
 
Additions to long-lived assets  | 
$  | 
6,880  | 
 
  | 
   | 
$  | 
4,240  | 
 
  | 
   | 
$  | 
17  | 
 
  | 
   | 
$  | 
3,497  | 
 
  | 
   | 
$  | 
398  | 
 
  | 
   | 
$  | 
1,004  | 
 
  | 
   | 
$  | 
54  | 
 
  | 
   | 
$  | 
285  | 
 
  | 
   | 
$  | 
910  | 
 
  | 
   | 
$  | 
175  | 
 
  | 
   | 
$  | 
176  | 
 
  | 
   | 
$  | 
17,636  | 
 
  | 
 
Transfers from non-operating properties  | 
$  | 
29,084  | 
 
  | 
   | 
$  | 
10,854  | 
 
  | 
   | 
$  | 
—  | 
 
  | 
   | 
$  | 
20,957  | 
 
  | 
   | 
$  | 
—  | 
 
  | 
   | 
$  | 
12  | 
 
  | 
   | 
$  | 
104  | 
 
  | 
   | 
$  | 
24,617  | 
 
  | 
   | 
$  | 
2,679  | 
 
  | 
   | 
$  | 
2  | 
 
  | 
   | 
$  | 
66,449  | 
 
  | 
   | 
$  | 
154,758  | 
 
  | 
 
Segment assets at June 30, 2013  | 
$  | 
1,271,384  | 
 
  | 
   | 
$  | 
571,851  | 
 
  | 
   | 
$  | 
118,827  | 
 
  | 
   | 
$  | 
51,663  | 
 
  | 
   | 
$  | 
101,476  | 
 
  | 
   | 
$  | 
97,084  | 
 
  | 
   | 
$  | 
313,788  | 
 
  | 
   | 
$  | 
102,098  | 
 
  | 
   | 
$  | 
171,745  | 
 
  | 
   | 
$  | 
81,334  | 
 
  | 
   | 
$  | 
167,312  | 
 
  | 
   | 
$  | 
3,048,562  | 
 
  | 
 
  
 
 | 
      
      
        | Schedule of reconciliation of net operating income from real estate operations and service operations to (loss) income from continuing operations | 
        
The following table reconciles our NOI from real estate operations for reportable segments and NOI from service operations to income from continuing operations as reported on our consolidated statements of operations (in thousands): 
 |  
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 
   | 
For the Three Months Ended June 30,  | 
   | 
For the Six Months Ended June 30,  | 
 
   | 
2014  | 
   | 
2013  | 
   | 
2014  | 
   | 
2013  | 
 
NOI from real estate operations  | 
$  | 
72,108  | 
 
  | 
   | 
$  | 
80,621  | 
 
  | 
   | 
$  | 
147,252  | 
 
  | 
   | 
$  | 
158,632  | 
 
  | 
 
NOI from service operations  | 
725  | 
 
  | 
   | 
1,413  | 
 
  | 
   | 
3,891  | 
 
  | 
   | 
2,198  | 
 
  | 
 
Interest and other income  | 
1,299  | 
 
  | 
   | 
2,006  | 
 
  | 
   | 
2,584  | 
 
  | 
   | 
2,952  | 
 
  | 
 
Equity in (loss) income of unconsolidated entities  | 
(47  | 
)  | 
   | 
126  | 
 
  | 
   | 
13  | 
 
  | 
   | 
167  | 
 
  | 
 
Income tax expense  | 
(92  | 
)  | 
   | 
(21  | 
)  | 
   | 
(156  | 
)  | 
   | 
(37  | 
)  | 
 
Other adjustments:  | 
—  | 
 
  | 
   | 
   | 
 
  | 
   | 
—  | 
 
  | 
   | 
   | 
 
  | 
 
Depreciation and other amortization associated with real estate operations  | 
(30,895  | 
)  | 
   | 
(27,673  | 
)  | 
   | 
(74,491  | 
)  | 
   | 
(54,683  | 
)  | 
 
Impairment losses  | 
(1,302  | 
)  | 
   | 
—  | 
 
  | 
   | 
(1,302  | 
)  | 
   | 
—  | 
 
  | 
 
General, administrative and leasing expenses  | 
(7,528  | 
)  | 
   | 
(6,583  | 
)  | 
   | 
(15,671  | 
)  | 
   | 
(14,403  | 
)  | 
 
Business development expenses and land carry costs  | 
(1,351  | 
)  | 
   | 
(1,327  | 
)  | 
   | 
(2,677  | 
)  | 
   | 
(2,686  | 
)  | 
 
Interest expense on continuing operations  | 
(23,478  | 
)  | 
   | 
(21,102  | 
)  | 
   | 
(44,305  | 
)  | 
   | 
(41,392  | 
)  | 
 
NOI from discontinued operations  | 
79  | 
 
  | 
   | 
(6,222  | 
)  | 
   | 
40  | 
 
  | 
   | 
(12,664  | 
)  | 
 
Loss on early extinguishment of debt  | 
(270  | 
)  | 
   | 
(21,470  | 
)  | 
   | 
(270  | 
)  | 
   | 
(26,654  | 
)  | 
 
Income (loss) from continuing operations  | 
$  | 
9,248  | 
 
  | 
   | 
$  | 
(232  | 
)  | 
   | 
$  | 
14,908  | 
 
  | 
   | 
$  | 
11,430  | 
 
  | 
 
  
 
 |