Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies (Details)

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Commitments and Contingencies (Details) (USD $)
 1 Months Ended 12 Months Ended
Aug. 31, 2010
Dec. 31, 2012
Property
Dec. 31, 2012
Nonrecourse loan guarantees of unconsolidated partnership
Dec. 31, 2012
Arundel Preserve 5, LLC, Date Acquired 7/2/2007
sqft
acre
Joint Ventures        
Maximum approximate amount required to be paid under the guarantees     $ 64,000,000  
Recovery percentage of amount paid under the guarantee     80.00%  
Maximum amount of office space to be developed through the joint venture (in square feet)       1,300,000
Land available to develop office space (in acres)       92
Ownership (as a percent)       50.00%
Tax incremental financing obligation        
The amount of tax incremental financing bonds issued by Anne Arundel County, Maryland 30,000,000      
Liability recognized with regard to tax incremental financing obligation at end of current period   3,600,000    
Future minimum rental payments due:        
2013   919,000    
2014   973,000    
2015   974,000    
2016   974,000    
2017   974,000    
Thereafter   81,700,000    
Total   86,514,000    
Environmental Indemnity Agreement        
Number of lease properties which were provided environmental indemnifications   3    
Environmental indemnification to the tenant against losses covered under prior owner's indemnity agreement   5,000,000    
Maximum environmental indemnification to the tenant against consequential damages after acquisition of property   12,500,000    
Additional costs agreed to be paid by the entity related to construction and environmental regulatory activities (as a percent)   50.00%    
Maximum annual additional costs agreed to be paid by the entity related to construction and environmental regulatory activities   300,000    
Maximum additional costs agreed to be paid by the entity related to construction and environmental regulatory activities   $ 1,500,000