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Concentration of Rental Revenue | 12 Months Ended
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Dec. 31, 2014
Risks and Uncertainties [Abstract] |
Concentration of Rental Revenue | Concentration of Rental Revenue We derived large concentrations of our revenue from real estate operations from certain tenants during the periods set forth in our consolidated statements of operations. The following table summarizes the percentage of our rental revenue (which excludes tenant recoveries and other real estate operations revenue) earned from (1) individual tenants that accounted for at least 5% of our rental revenue from continuing and discontinued operations and (2) the aggregate of the five tenants from which we recognized the most rental revenue in the respective years:
|  | For the Years Ended December 31,
|  | 2014 |  | 2013 |  | 2012
United States Government |  | 18 | % |  | 18 | % |  | 18 | %
Northrop Grumman Corporation (1) |  | 6 | % |  | 8 | % |  | 7 | %
Booz Allen Hamilton, Inc. |  | 6 | % |  | 6 | % |  | 6 | %
Computer Sciences Corporation (1) |  | N/A |  |  | 5 | % |  | 5 | %
Five largest tenants |  | 39 | % |  | 41 | % |  | 39 | %
(1) Includes affiliated organizations and agencies and predecessor companies. Our rental revenue from the United States Government was earned primarily from properties in the Baltimore/Washington Corridor, San Antonio, Texas (“San Antonio”), St. Mary’s & King George Counties and Colorado Springs regions. We also derived in excess of 90% of our construction contract revenue from the United States Government in each of the years set forth on the consolidated statements of operations. In addition, we derived large concentrations of our total revenue from real estate operations (defined as the sum of rental revenue and tenant recoveries and other real estate operations revenue) from certain geographic regions. These concentrations are set forth in the segment information provided in Note 18. Several of these regions, including the Baltimore/Washington Corridor, Northern Virginia, Washington, DC - Capitol Riverfront, St. Mary’s & King George Counties and Greater Baltimore, are within close proximity to each other, and all but three of our regions with real estate operations (San Antonio, Huntsville, Alabama (“Huntsville”) and Colorado Springs) are located in the Mid-Atlantic region of the United States.

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- Definition The entire disclosure for any concentrations existing at the date of the financial statements that make an entity vulnerable to a reasonably possible, near-term, severe impact. This disclosure informs financial statement users about the general nature of the risk associated with the concentration, and may indicate the percentage of concentration risk as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6327-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6442-108592 + Details
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