Quarterly report pursuant to Section 13 or 15(d)

Real Estate - Variable Interest Entities (Details)

v3.2.0.727
Real Estate - Variable Interest Entities (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Real Estate Properties [Line Items]          
Real estate impairment $ 5,909 $ 0 $ 5,909 $ 0  
Land 542,654   542,654   $ 543,546
Mortgage notes payable $ 419,755   $ 419,755   418,525
First Street 1225 [Member]          
Real Estate Properties [Line Items]          
Variable interest entity, qualitative or quantitative information, ownership percentage     95.00%    
Noncontrolling interest, ownership percentage by noncontrolling owners 5.00%   5.00%    
Percentage of capital contribution through debt     70.00%    
Six Fifty North Glebe Road [Member]          
Real Estate Properties [Line Items]          
Variable interest entity, qualitative or quantitative information, ownership percentage     90.00%    
Noncontrolling interest, ownership percentage by noncontrolling owners 10.00%   10.00%    
650 N Glebe [Member] [Domain]          
Real Estate Properties [Line Items]          
Mortgage notes payable $ 31,115   $ 31,115   27,690
First Street 1225 [Member]          
Real Estate Properties [Line Items]          
Purchase and sale agreement, Sale Price 14,500   14,500    
Real estate impairment     5,900    
Cash, Cash Equivalents, and Short-term Investments 18   18   395
Land and capitalized development costs related to joint ventures 15,292   15,292   20,807
Accounts payable and accrued liabilities related to joint ventures 11   11   38
Six Fifty North Glebe Road [Member]          
Real Estate Properties [Line Items]          
Land 12,851   12,851   12,851
Investment Building and Building Improvements 37,690   37,690   18,432
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment (1,167)   (1,167)   0
Land and capitalized development costs related to joint ventures 0   0   17,947
Other Assets 513   513   0
Real Estate Investments, Joint Ventures 49,887   49,887   49,230
Construction Payable 782   782   2,196
Accrued Liabilities 51   51   17
Accounts payable and accrued liabilities related to joint ventures $ 31,948   $ 31,948   $ 29,903