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Subsequent Event (Details)
$ in Thousands
12 Months Ended
Jan. 13, 2016
USD ($)
property
Dec. 31, 2015
USD ($)
project
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Subsequent Event [Line Items]        
Mortgage loans assumed with acquisition   $ 89,516 $ 68,282 $ 0
Number of real estate properties | project   90    
Clarion | Subsequent Event        
Subsequent Event [Line Items]        
Ownership percentage in partnership 70.00%      
Purchase Price $ 153,700      
Cash paid in acquisition 130,000      
Mortgage loans assumed with acquisition $ 34,400      
Number of real estate properties | property 6