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Real Estate (Details)
$ in Thousands
3 Months Ended 15 Months Ended
Jan. 13, 2016
USD ($)
property
Mar. 31, 2016
USD ($)
project
Mar. 31, 2015
USD ($)
Mar. 31, 2016
USD ($)
project
Dec. 31, 2015
Significant Acquisitions [Line Items]          
Number of real estate properties | project   96   96  
Mortgage loans assumed in acquisition   $ 34,385 $ 18,666    
Gain on change in control of interests   25,726 $ 0    
Clarion          
Significant Acquisitions [Line Items]          
Number of real estate properties | property 6        
Ownership Percentage in partnership 70.00%        
Purchase price $ 153,700        
Cash paid in acquisition 130,000        
Mortgage loans assumed in acquisition 34,400        
Gain on change in control of interests   25,700      
Other Liabilities | Clarion          
Significant Acquisitions [Line Items]          
Other assets acquired for below market leases 4,900        
Amortization of above market leases | Other Assets | Clarion          
Significant Acquisitions [Line Items]          
Other assets acquired for above market leases $ 7,300        
General and Administrative Expense | Clarion          
Significant Acquisitions [Line Items]          
Acquisition costs incurred   $ 100   $ 200  
Federal Realty Investment Trust/Clarion Partners Partnership | Federal Realty Investment Trust          
Significant Acquisitions [Line Items]          
Ownership Percentage in partnership         30.00%
Federal Realty Investment Trust/Clarion Partners Partnership | Clarion          
Significant Acquisitions [Line Items]          
Ownership Percentage in partnership         70.00%