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Discontinued Operations (Details) (USD $)
 12 Months Ended 0 Months Ended 3 Months Ended 1 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Discontinued operations
Dec. 31, 2012
Discontinued operations
Dec. 31, 2011
Discontinued operations
Oct. 29, 2013
Discontinued operations
Commercial property in Richardson, Texas
Dec. 21, 2012
Discontinued operations
Commercial property in Southfield, Michigan
Sep. 30, 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                      
Gain (Loss) on sale of properties             $ 2,200,000 $ (14,800,000)   $ 2,300,000 $ 19,600,000
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    
Sale price of properties sold               300,000      
Assets held for sale                      
Land 185,479,000 141,545,000     2,791,000            
Building 1,603,941,000 1,172,928,000     5,216,000            
Total real estate assets, gross 1,790,590,000 1,315,377,000     8,007,000            
Less accumulated depreciation 222,252,000 180,589,000     167,000            
Real estate assets, net 1,568,338,000 1,134,788,000     7,840,000            
Straight-line rent receivable 42,261,000 35,374,000     67,000            
Deferred leasing commissions, net of accumulated amortization of $81 27,837,000 23,376,000     3,779,000            
Deferred leasing commissions, accumulated amortization 15,031,000 11,812,000     859,000            
Acquired unfavorable leases, net of accumulated amortization of $252         (1,111,000)            
Acquired unfavorable leases, accumulated amortization         252,000            
Assets held for sale   10,575,000   0 10,575,000       700,000    
Severance costs and professional fees           378,000          
Assets of the investment banking segment       0 0 0          
Operating results for the asset held for sale                      
Rental revenue 206,926,000 150,434,000 133,946,000 991,000 2,334,000 2,134,000          
Related party revenue:                      
Syndication fees           4,670,000          
Transaction fees           4,454,000          
Other income           42,000          
Rental operating expenses (51,100,000) (37,440,000) (35,074,000)   (1,089,000) (1,616,000)          
Real estate taxes and insurance (31,616,000) (22,904,000) (20,112,000)   (340,000) (377,000)          
Selling, general and administrative (11,911,000) (9,916,000) (6,855,000)     (3,488,000)          
Commissions           (2,535,000)          
Depreciation and amortization (78,839,000) (54,051,000) (47,417,000) (616,000) (1,396,000) (1,070,000)          
Interest income 16,000 51,000 22,000     14,000          
Net income (loss) from discontinued operations $ 375,000 $ (491,000) $ 2,228,000 $ 375,000 $ (491,000) $ 2,228,000