Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events (Details)

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Subsequent Events (Details)
$ in Thousands
Jul. 01, 2015
USD ($)
unit
Jun. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Subsequent Event [Line Items]      
Real Estate Investment Property, at Cost   $ 2,509,266 $ 2,470,953
Wellington | Apartment Building [Member] | Subsequent Event      
Subsequent Event [Line Items]      
Number of Units in Real Estate Property | unit 711    
Property Acquired | Wellington | Subsequent Event      
Subsequent Event [Line Items]      
Real Estate Investment Property, at Cost $ 167,000