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Rentals Under Operating Leases (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Operating Leased Assets [Line Items]      
Tenant Reimbursements $ 34,600 $ 31,600 $ 26,800
2016 194,033    
2017 175,606    
2018 150,901    
2019 134,234    
2020 115,195    
Thereafter 307,971    
Operating Leases, Future Minimum Payments Receivable $ 1,077,940    
Multifamily Properties [Member]      
Operating Leased Assets [Line Items]      
Lessee Leasing Arrangements, Operating Leases, Term of Contract 1 year