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Real Estate Investments - Noncontrolling Interests in Subsidiaries and VIEs (Details)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2011
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Nov. 30, 2011
Aug. 31, 2007
a
Real Estate Properties [Line Items]              
Real estate impairment $ 5,900   $ 5,909 $ 0 $ 0    
Land     561,256 543,546      
Real Estate Investment Property, Accumulated Depreciation     (692,608) (640,434)      
Properties under development or held for future development     36,094 76,235      
Mortgage notes payable     418,052 417,194      
Accounts payable and other liabilities     45,367 54,318      
Tenant security deposits     $ 9,378 8,899      
Maximum [Member]              
Real Estate Properties [Line Items]              
Ownership percentage     95.00%        
4661 Kenmore Avenue [Member]              
Real Estate Properties [Line Items]              
Land, Acres Held | a             0.8
Six Fifty North Glebe Road [Member]              
Real Estate Properties [Line Items]              
Ownership percentage   90.00%          
Variable Interest Entity, Consolidated, Carrying Amount, Assets     $ 0 17,947      
Land     12,851 12,851      
Investment Building and Building Improvements     37,791 18,432      
Real Estate Investment Property, Accumulated Depreciation     (2,347) 0      
Properties under development or held for future development     1,188 0      
Real Estate Investments, Joint Ventures     49,483 49,230      
Mortgage notes payable     32,214 27,690      
Accounts payable and other liabilities     256 2,196      
Tenant security deposits     $ 82 $ 17      
Variable Interest Entity, Classification of Carrying Amount, Liabilities     32552 29903      
1225 First Street [Member]              
Real Estate Properties [Line Items]              
Ownership percentage by noncontrolling owners           5.00%  
Variable Interest Entity, Consolidated, Carrying Amount, Assets       $ 20,800      
Multifamily [Member]              
Real Estate Properties [Line Items]              
Properties under development or held for future development     $ 16,307 $ 39,356      
Multifamily [Member] | 1225 First Street [Member]              
Real Estate Properties [Line Items]              
Disposal Group, Not Discontinued Operation, Sale Price     $ 14,500