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Discontinued Operations (Details) (USD $)
 12 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Discontinued operations
Dec. 31, 2011
Discontinued operations
Dec. 31, 2010
Discontinued operations
Dec. 31, 2012
Discontinued operations
Commercial property in Southfield, Michigan
Sep. 30, 2012
Discontinued operations
Commercial property in Southfield, Michigan
Dec. 31, 2012
Discontinued operations
Commercial property in Southfield, Michigan
Jun. 30, 2011
Discontinued operations
Industrial property in Savage, Maryland
Jan. 31, 2011
Discontinued operations
Commercial property in Falls Church, Virginia
Discontinued operations                      
Expected term for sale of property       1 year              
Provision for loss on a property held for sale net of applicable income tax       $ 14,300,000       $ 14,300,000      
Sale price of properties sold                 300,000    
Gain (Loss) on sale of properties (14,826,000) 21,939,000         (14,800,000)     2,300,000 19,600,000
Assets held for sale                      
Land 144,336,000 132,393,000     5,110,000            
Building 1,178,144,000 1,006,267,000     14,182,000            
Fixtures and equipment 904,000 831,000     25,000            
Total real estate assets, gross 1,323,384,000 1,139,491,000     19,317,000            
Less accumulated depreciation 180,756,000 148,266,000     4,321,000            
Real estate assets, net 1,142,628,000 991,225,000     14,996,000            
Straight-line rent receivable 35,441,000 28,502,000     43,000            
Deferred leasing commissions, net of accumulated amortization of $81 23,376,000 22,325,000     316,000            
Deferred leasing commissions, accumulated amortization 11,812,000 9,139,000     81,000            
Assets held for sale   15,355,000     15,355,000     700,000      
Severance costs and professional fees       378,000              
Operating results for the asset held for sale                      
Rental revenue 151,656,000 134,238,000 113,274,000 1,113,000 1,842,000 10,112,000          
Related party revenue:                      
Syndication fees         4,670,000 2,544,000          
Transaction fees         4,454,000 2,727,000          
Other income         42,000            
Rental operating expenses (37,441,000) (35,076,000) (32,042,000) (1,088,000) (1,614,000) (1,631,000)          
Real estate taxes and insurance (22,913,000) (20,114,000) (17,782,000) (332,000) (375,000) (1,303,000)          
Selling, general and administrative (9,916,000) (6,913,000) (6,399,000)   (3,430,000) (2,887,000)          
Commissions         (2,535,000) (1,477,000)          
Depreciation and amortization (54,872,000) (47,622,000) (35,640,000) (575,000) (865,000) (3,722,000)          
Interest income 51,000 22,000 25,000   14,000 1,000          
Net (loss) income from discontinued operations $ (882,000) $ 2,203,000 $ 4,364,000 $ (882,000) $ 2,203,000 $ 4,364,000